Update manifest.json for latest build (5152f6f)

Three routes now deliver truth data -- a sidecar, a worker push, and a fetched
manifest -- and once stored they were indistinguishable. The truth file records
nothing about how it arrived, so a locally computed sidecar and a loose-tier
manifest from a third-party server looked identical to every reader, despite
making claims of very different strength about the same item.

TruthProvenance records source, server, match tier, applied offset and caveat.
GET /Items/{itemId}/Provenance serves it, and JR-036's loose-tier caveat now
has somewhere to come from.

Two decisions carried in the code rather than assumed:

Provenance is stored BESIDE the truth file, never inside it. Injecting fields
would mean the bytes served back are not the bytes the producer wrote, which is
the property JR-004 turns on. UT-026 pins it by asserting the stored truth JSON
contains no provenance keys.

The applied offset is recorded because it is otherwise unrecoverable. Once
JR-030 shifts every window the timings look native, and nothing else would say
they had been shifted -- which matters when diagnosing an overlay that is
consistently a few seconds out.

A sidecar's provenance is derived rather than stored: it is local, and its
timestamp is the file's own. Precedence resolves through the same rule as
GetTruthAsync, because resolving it twice by different rules is how the two
would drift.

Fourth mutation check: stopping Delete from removing provenance fails UT-027
alone -- a stale record would otherwise outlive its claim and describe data the
next fetch had already replaced.

TRACES: UT-024, UT-025, UT-026, UT-027, UT-028 | JR-010

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "scripts/vendor/jray-project"]
+	path = scripts/vendor/jray-project
+	url = git@gitea.tourolle.paris:dtourolle/jray-project.git

Jellyfin.Plugin.JRay.Tests/FileTransformationRegistrationTests.cs

@@ -0,0 +1,96 @@
+using System;
+using System.Collections.Generic;
+using Jellyfin.Plugin.JRay.Models;
+using Jellyfin.Plugin.JRay.Services;
+using Microsoft.Extensions.Logging;
+using Xunit;
+
+namespace Jellyfin.Plugin.JRay.Tests;
+
+/// <summary>
+/// JR-023 — absent the File Transformation plugin, disable *only* the overlay
+/// and say so. There is no on-disk fallback (JR-021), so the failure path is
+/// the one an admin will actually meet, and it has to be legible: silently
+/// serving no overlay is indistinguishable from a broken install.
+///
+/// The File Transformation assembly is not loaded in the test host, so
+/// TryRegister exercises its not-found branch for real rather than through a
+/// seam invented for the test.
+///
+/// TRACES: UT-012, UT-013, UT-014, UT-015 | JR-023
+/// </summary>
+public class FileTransformationRegistrationTests
+{
+    // UT-012
+    [Fact]
+    public void TryRegister_WithPluginAbsent_ReturnsFalse()
+    {
+        Assert.False(FileTransformationRegistration.TryRegister(new CapturingLogger()));
+    }
+
+    // UT-013
+    [Fact]
+    public void TryRegister_WithPluginAbsent_WarnsNamingThePluginAndHowToInstallIt()
+    {
+        var logger = new CapturingLogger();
+
+        FileTransformationRegistration.TryRegister(logger);
+
+        var entry = Assert.Single(logger.Entries);
+
+        // Warning, not Information: the overlay is a headline feature and it is
+        // off. Logging this at Information buries it among startup chatter.
+        Assert.Equal(LogLevel.Warning, entry.Level);
+
+        // The message has to carry the install URL, and must not promise the
+        // on-disk fallback that JR-021 removed.
+        Assert.Contains(FileTransformationRegistration.ManifestUrl, entry.Message, StringComparison.Ordinal);
+        Assert.DoesNotContain("falling back", entry.Message, StringComparison.OrdinalIgnoreCase);
+    }
+
+    // UT-014
+    [Fact]
+    public void TransformIndexHtml_WithOverlayDisabled_ReturnsContentsUnchanged()
+    {
+        // No Plugin instance exists in the test host, so OverlayEnabled is
+        // false — the same branch taken when an admin switches the overlay off.
+        var html = "<html><body><div>x</div>\n</body></html>";
+
+        var result = FileTransformationRegistration.TransformIndexHtml(
+            new TransformationPayload { Contents = html });
+
+        Assert.Equal(html, result);
+    }
+
+    // UT-015
+    [Fact]
+    public void TransformIndexHtml_WithNullContents_ReturnsEmptyRatherThanThrowing()
+    {
+        // This callback is invoked by another plugin's code on every page
+        // served. Throwing here would break the web client itself, not just
+        // JRay's overlay.
+        var result = FileTransformationRegistration.TransformIndexHtml(new TransformationPayload());
+
+        Assert.Equal(string.Empty, result);
+    }
+
+    private sealed class CapturingLogger : ILogger
+    {
+        public List<(LogLevel Level, string Message)> Entries { get; } = new();
+
+        public IDisposable? BeginScope<TState>(TState state)
+            where TState : notnull => null;
+
+        public bool IsEnabled(LogLevel logLevel) => true;
+
+        public void Log<TState>(
+            LogLevel logLevel,
+            EventId eventId,
+            TState state,
+            Exception? exception,
+            Func<TState, Exception?, string> formatter)
+        {
+            Entries.Add((logLevel, formatter(state, exception)));
+        }
+    }
+}

Jellyfin.Plugin.JRay.Tests/Jellyfin.Plugin.JRay.Tests.csproj

@@ -0,0 +1,56 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+    <!--
+      The plugin project treats warnings as errors and runs StyleCop. Tests do
+      not inherit that: their naming conventions differ deliberately (Method_
+      Condition_Expectation reads as documentation, and trips SA1300-family
+      rules), and a style failure in a test is not a defect in the thing under
+      test.
+    -->
+    <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <GenerateDocumentationFile>false</GenerateDocumentationFile>
+    <!--
+      The plugin targets net9.0 to match Jellyfin's ABI, but a machine that can
+      build it need not have the 9.0 *runtime* installed. Roll the test host
+      forward to whatever major is present so the suite runs on a developer box
+      and on CI without pinning either to a runtime that is not the plugin's.
+    -->
+    <RollForward>LatestMajor</RollForward>
+    <!--
+      The plugin framework-references Microsoft.AspNetCore.App through
+      Jellyfin.Controller, and that reference flows into anything referencing
+      the plugin. The T1 tier tests pure logic that touches no web type, so
+      inheriting the web framework would make the suite unrunnable on any box
+      without the ASP.NET Core runtime for no benefit. .NET resolves assemblies
+      lazily, so types that never touch ASP.NET load fine without it.
+
+      T2 (controllers, authorisation) genuinely needs that runtime. When those
+      tests arrive they belong in a second project that keeps this reference.
+    -->
+    <DisableTransitiveFrameworkReferences>true</DisableTransitiveFrameworkReferences>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <!--
+      The plugin sets ExcludeAssets=runtime on these: at run time the Jellyfin
+      server supplies them, so shipping copies in the plugin would risk loading
+      a second, different MediaBrowser.Common. The test host is not the server,
+      so it has to bring its own — hence the same packages without that
+      exclusion, and only here.
+    -->
+    <PackageReference Include="Jellyfin.Controller" Version="10.11.5" />
+    <PackageReference Include="Jellyfin.Model" Version="10.11.5" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
+    <PackageReference Include="xunit" Version="2.9.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Jellyfin.Plugin.JRay\Jellyfin.Plugin.JRay.csproj" />
+  </ItemGroup>
+
+</Project>

Jellyfin.Plugin.JRay.Tests/ManagedTruthStoreTests.cs

@@ -0,0 +1,194 @@
+using System;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using Jellyfin.Plugin.JRay.Configuration;
+using Jellyfin.Plugin.JRay.Models;
+using Jellyfin.Plugin.JRay.Services;
+using MediaBrowser.Common.Configuration;
+using Microsoft.Extensions.Logging.Abstractions;
+using Xunit;
+
+namespace Jellyfin.Plugin.JRay.Tests;
+
+/// <summary>
+/// JR-010 — three sources now deliver truth data (sidecar, pushed, fetched) and
+/// they are not interchangeable. A locally computed sidecar and a
+/// <c>loose</c>-tier manifest from a third-party server make claims of very
+/// different strength about the same item, and the truth file itself records
+/// nothing about how it arrived.
+///
+/// TRACES: UT-024, UT-025, UT-026, UT-027, UT-028 | JR-010
+/// </summary>
+public class ManagedTruthStoreTests : IDisposable
+{
+    private readonly string _root;
+    private readonly ManagedTruthStore _store;
+
+    public ManagedTruthStoreTests()
+    {
+        _root = Path.Combine(Path.GetTempPath(), "jray-tests-" + Guid.NewGuid().ToString("N"));
+        Directory.CreateDirectory(_root);
+        _store = new ManagedTruthStore(new FakePaths(_root), NullLogger<ManagedTruthStore>.Instance);
+    }
+
+    public void Dispose()
+    {
+        GC.SuppressFinalize(this);
+        if (Directory.Exists(_root))
+        {
+            Directory.Delete(_root, recursive: true);
+        }
+    }
+
+    private static TruthFile Truth()
+    {
+        var truth = new TruthFile { SchemaVersion = 1, Movie = "/m.mkv" };
+        var actor = new TruthActor { Name = "A", TmdbId = "884" };
+        actor.Scenes.Add([1.0, 2.0]);
+        truth.Actors.Add(actor);
+        return truth;
+    }
+
+    // UT-024
+    [Fact]
+    public async Task SaveAsync_ThenLoadProvenance_RoundTripsAFetchedClaim()
+    {
+        var id = Guid.NewGuid();
+        var recorded = new DateTime(2026, 7, 31, 12, 0, 0, DateTimeKind.Utc);
+
+        await _store.SaveAsync(
+            id,
+            Truth(),
+            new TruthProvenance
+            {
+                Source = TruthSource.Fetched,
+                ServerUrl = "https://jray.example",
+                MatchTier = MatchTier.Loose,
+                OffsetSec = -12.5,
+                Caveat = "loose match",
+                RecordedAt = recorded,
+            },
+            CancellationToken.None);
+
+        var loaded = _store.LoadProvenance(id);
+
+        Assert.NotNull(loaded);
+        Assert.Equal(TruthSource.Fetched, loaded!.Source);
+        Assert.Equal("https://jray.example", loaded.ServerUrl);
+        Assert.Equal(MatchTier.Loose, loaded.MatchTier);
+
+        // The offset is unrecoverable once applied: the stored windows look
+        // native, and nothing else would say they had been shifted.
+        Assert.Equal(-12.5, loaded.OffsetSec);
+        Assert.Equal("loose match", loaded.Caveat);
+        Assert.Equal(recorded, loaded.RecordedAt);
+    }
+
+    // UT-025
+    [Fact]
+    public async Task SaveAsync_LocalPush_RecordsNoServerOrTier()
+    {
+        var id = Guid.NewGuid();
+
+        await _store.SaveAsync(
+            id,
+            Truth(),
+            TruthProvenance.Local(TruthSource.Pushed, DateTime.UtcNow),
+            CancellationToken.None);
+
+        var loaded = _store.LoadProvenance(id)!;
+
+        Assert.Equal(TruthSource.Pushed, loaded.Source);
+        Assert.Equal(string.Empty, loaded.ServerUrl);
+
+        // A push is about *this* file, so there is no cut to match. A tier here
+        // would be a fabricated claim.
+        Assert.Null(loaded.MatchTier);
+    }
+
+    // UT-026
+    [Fact]
+    public async Task SaveAsync_DoesNotWriteProvenanceIntoTheTruthFile()
+    {
+        var id = Guid.NewGuid();
+        await _store.SaveAsync(id, Truth(), TruthProvenance.Local(TruthSource.Pushed, DateTime.UtcNow), CancellationToken.None);
+
+        var truthJson = await File.ReadAllTextAsync(
+            Path.Combine(_root, "plugins", "configurations", "JRay", "truth", id.ToString("D") + ".json"));
+
+        // JR-004: the bytes served back are the bytes the producer wrote.
+        Assert.DoesNotContain("source", truthJson, StringComparison.OrdinalIgnoreCase);
+        Assert.DoesNotContain("match_tier", truthJson, StringComparison.OrdinalIgnoreCase);
+    }
+
+    // UT-027
+    [Fact]
+    public async Task Delete_RemovesProvenanceToo()
+    {
+        var id = Guid.NewGuid();
+        await _store.SaveAsync(id, Truth(), TruthProvenance.Local(TruthSource.Pushed, DateTime.UtcNow), CancellationToken.None);
+
+        Assert.True(_store.Delete(id));
+
+        // A stale provenance record outliving its truth file would describe data
+        // the next fetch has already replaced.
+        Assert.Null(_store.LoadProvenance(id));
+        Assert.False(_store.Exists(id));
+    }
+
+    // UT-028
+    [Fact]
+    public void LoadProvenance_ForUnknownItem_ReturnsNull()
+    {
+        Assert.Null(_store.LoadProvenance(Guid.NewGuid()));
+    }
+
+    private sealed class FakePaths : IApplicationPaths
+    {
+        public FakePaths(string root)
+        {
+            ProgramDataPath = root;
+            PluginsPath = Path.Combine(root, "plugins");
+            PluginConfigurationsPath = Path.Combine(root, "plugins", "configurations");
+        }
+
+        public string ProgramDataPath { get; }
+
+        public string WebPath => Path.Combine(ProgramDataPath, "web");
+
+        public string ProgramSystemPath => ProgramDataPath;
+
+        public string DataPath => ProgramDataPath;
+
+        public string ImageCachePath => ProgramDataPath;
+
+        public string PluginsPath { get; }
+
+        public string PluginConfigurationsPath { get; }
+
+        public string LogDirectoryPath => ProgramDataPath;
+
+        public string ConfigurationDirectoryPath => ProgramDataPath;
+
+        public string SystemConfigurationFilePath => Path.Combine(ProgramDataPath, "system.xml");
+
+        public string CachePath { get; set; } = string.Empty;
+
+        public string TempDirectory => Path.Combine(ProgramDataPath, "temp");
+
+        public string TrickplayPath => Path.Combine(ProgramDataPath, "trickplay");
+
+        public string VirtualDataPath => ProgramDataPath;
+
+        public string BackupPath => Path.Combine(ProgramDataPath, "backup");
+
+        public void MakeSanityCheckOrThrow()
+        {
+        }
+
+        public void CreateAndCheckMarker(string path, string markerName, bool recursive = false)
+        {
+        }
+    }
+}

Jellyfin.Plugin.JRay.Tests/ManifestExchangeTests.cs

@@ -0,0 +1,319 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Jellyfin.Plugin.JRay.Configuration;
+using Jellyfin.Plugin.JRay.Models;
+using Jellyfin.Plugin.JRay.Services;
+using Xunit;
+
+namespace Jellyfin.Plugin.JRay.Tests;
+
+/// <summary>
+/// Tests for the manifest exchange: tier policy, transport rules, validation on
+/// receipt, and offset application.
+/// </summary>
+public class ManifestExchangeTests
+{
+    private static ManifestServer Server(string url) =>
+        new() { Url = url, Name = "test", Enabled = true };
+
+    private static TitleQuery Query() =>
+        new() { TmdbId = "504172", RuntimeSec = 6420.5 };
+
+    // -----------------------------------------------------------------------
+    // The withdrawn file-hash tier
+    // -----------------------------------------------------------------------
+
+    [Fact]
+    public void MatchTierHasNoExactMember()
+    {
+        // The `exact` tier keyed on an OpenSubtitles file hash and was withdrawn
+        // on legal grounds: a file hash identifies the exact release a user
+        // holds, not the cut the timings describe, so sending one turns a
+        // catalogue lookup into a release-identification service.
+        //
+        // Asserted on the enum rather than trusted, because "we removed it" is
+        // exactly the kind of decision a later reader re-adds as an oversight.
+        var names = Enum.GetNames<MatchTier>();
+        Assert.DoesNotContain("Exact", names);
+        Assert.Equal(new[] { "Loose", "Runtime", "Audio" }, names);
+    }
+
+    [Fact]
+    public void AudioIsTheTopTier()
+    {
+        // Content-derived, so it identifies the cut rather than the copy — which
+        // is what makes it an acceptable replacement for the file hash.
+        Assert.True(MatchTier.Audio > MatchTier.Runtime);
+        Assert.True(MatchTier.Runtime > MatchTier.Loose);
+        Assert.Equal(MatchTier.Audio, Enum.GetValues<MatchTier>().Max());
+    }
+
+    [Fact]
+    public void NoVideoHashIsEverSent()
+    {
+        // Structural, not merely policy: `TitleQuery` has no VideoHash property,
+        // so there is nothing a future caller could populate.
+        Assert.Null(typeof(TitleQuery).GetProperty("VideoHash"));
+
+        var query = new TitleQuery { TmdbId = "504172", RuntimeSec = 6420.5 };
+        Assert.DoesNotContain("video_hash", query.ToQueryString(), StringComparison.Ordinal);
+    }
+
+    [Fact]
+    public void AServerReportingTheWithdrawnTierIsDeclined()
+    {
+        // A server may still hold hashes from other clients. If one somehow
+        // reports `exact`, it is unrecognised rather than silently accepted
+        // under a tier this plugin has no policy for.
+        Assert.Null(ManifestExchangeClient.ParseTier("exact"));
+        Assert.Equal(MatchTier.Audio, ManifestExchangeClient.ParseTier("audio"));
+        Assert.Equal(MatchTier.Runtime, ManifestExchangeClient.ParseTier("runtime"));
+        Assert.Equal(MatchTier.Loose, ManifestExchangeClient.ParseTier("loose"));
+        Assert.Null(ManifestExchangeClient.ParseTier("nonsense"));
+    }
+
+    // -----------------------------------------------------------------------
+    // Transport
+    // -----------------------------------------------------------------------
+
+    [Theory]
+    [InlineData("https://jray.tourolle.paris", true)]
+    [InlineData("https://third.party.example", true)]
+    [InlineData("http://127.0.0.1:8080", true)]
+    [InlineData("http://localhost:8080", true)]
+    [InlineData("http://jray.tourolle.paris", false)]
+    [InlineData("http://192.168.1.10:8080", false)]
+    [InlineData("ftp://example.com", false)]
+    public void HttpsIsRequiredAwayFromLoopback(string url, bool acceptable)
+    {
+        // A plaintext server would let any network intermediary rewrite actor
+        // overlays, and the overlay is shown to the user as fact. Loopback is
+        // exempt because there is no network path to intercept.
+        Assert.Equal(acceptable, ManifestExchangeClient.IsTransportAcceptable(new Uri(url)));
+    }
+
+    [Fact]
+    public void AnUnusableServerUrlYieldsNoRequest()
+    {
+        Assert.Null(ManifestExchangeClient.BuildUrl(Server("http://example.com"), "manifests/movie", Query()));
+        Assert.Null(ManifestExchangeClient.BuildUrl(Server("not a url"), "manifests/movie", Query()));
+    }
+
+    [Fact]
+    public void QueryParametersAreEscaped()
+    {
+        var url = ManifestExchangeClient.BuildUrl(
+            Server("https://s.example/"),
+            "manifests/movie",
+            new TitleQuery { TmdbId = "504172", RuntimeSec = 6420.5 });
+
+        Assert.NotNull(url);
+        Assert.StartsWith("https://s.example/api/v1/manifests/movie?", url!.AbsoluteUri, StringComparison.Ordinal);
+        Assert.Contains("tmdb_id=504172", url.AbsoluteUri, StringComparison.Ordinal);
+        // Invariant formatting, so a comma-decimal locale cannot corrupt the runtime.
+        Assert.Contains("runtime_sec=6420.5", url.AbsoluteUri, StringComparison.Ordinal);
+    }
+
+    [Fact]
+    public void EpisodeCoordinatesAreSent()
+    {
+        var url = ManifestExchangeClient.BuildUrl(
+            Server("https://s.example"),
+            "manifests/episode",
+            new TitleQuery { SeriesTmdbId = "1396", Season = 2, Episode = 5, RuntimeSec = 2820 });
+
+        Assert.NotNull(url);
+        Assert.Contains("series_tmdb_id=1396", url!.AbsoluteUri, StringComparison.Ordinal);
+        Assert.Contains("season=2", url.AbsoluteUri, StringComparison.Ordinal);
+        Assert.Contains("episode=5", url.AbsoluteUri, StringComparison.Ordinal);
+    }
+
+    // -----------------------------------------------------------------------
+    // Validation on receipt — every server is untrusted
+    // -----------------------------------------------------------------------
+
+    private static Jmanifest ValidManifest()
+    {
+        var m = new Jmanifest { JmanifestVersion = 2 };
+        m.Identity = new JmanifestIdentity { Type = "movie", TmdbId = "504172" };
+        m.Cut = new JmanifestCut { RuntimeSec = 6420.5 };
+        var actor = new JmanifestActor { Name = "Steve Buscemi", TmdbId = "884" };
+        actor.Scenes.Add(new JmanifestScene { Start = 191.6, End = 209.2, Belief = 0.98, Route = "live" });
+        m.Actors.Add(actor);
+        return m;
+    }
+
+    [Fact]
+    public void AWellFormedManifestValidates()
+    {
+        Assert.True(ManifestValidator.TryValidate(ValidManifest(), 6420.5, out var error), error);
+    }
+
+    [Fact]
+    public void AnUnknownEnvelopeVersionIsRefused()
+    {
+        // Never guessed at: a server one version ahead may have changed the
+        // meaning of a field this plugin thinks it understands.
+        foreach (var version in new[] { 0, 1, 3, 99 })
+        {
+            var m = ValidManifest();
+            m.JmanifestVersion = version;
+            Assert.False(ManifestValidator.TryValidate(m, 6420.5, out var error));
+            Assert.Contains("jmanifest_version", error, StringComparison.Ordinal);
+        }
+    }
+
+    [Fact]
+    public void WindowsBeyondTheLocalRuntimeAreRejected()
+    {
+        // Bounds are checked against the *local* file, because that is what the
+        // overlay indexes into. A window past the end is evidence the manifest
+        // describes another cut.
+        var m = ValidManifest();
+        m.Actors[0].Scenes.Clear();
+        m.Actors[0].Scenes.Add(new JmanifestScene { Start = 10, End = 9000 });
+        Assert.False(ManifestValidator.TryValidate(m, 6420.5, out var error));
+        Assert.Contains("runtime", error, StringComparison.Ordinal);
+    }
+
+    [Fact]
+    public void InvertedNegativeAndNonFiniteWindowsAreRejected()
+    {
+        foreach (var scene in new[]
+        {
+            new JmanifestScene { Start = 50, End = 10 },
+            new JmanifestScene { Start = -1, End = 10 },
+            new JmanifestScene { Start = double.NaN, End = 10 },
+            new JmanifestScene { Start = 0, End = double.PositiveInfinity },
+        })
+        {
+            var m = ValidManifest();
+            m.Actors[0].Scenes.Clear();
+            m.Actors[0].Scenes.Add(scene);
+            Assert.False(ManifestValidator.TryValidate(m, 6420.5, out _));
+        }
+    }
+
+    [Fact]
+    public void BeliefOutsideZeroToOneIsRejected()
+    {
+        foreach (var belief in new[] { -0.1, 1.5, double.NaN })
+        {
+            var m = ValidManifest();
+            m.Actors[0].Scenes[0].Belief = belief;
+            Assert.False(ManifestValidator.TryValidate(m, 6420.5, out var error));
+            Assert.Contains("belief", error, StringComparison.Ordinal);
+        }
+    }
+
+    [Fact]
+    public void MalformedIdentifiersAreRejected()
+    {
+        var m = ValidManifest();
+        m.Actors[0].TmdbId = "884'; DROP TABLE--";
+        Assert.False(ManifestValidator.TryValidate(m, 6420.5, out _));
+
+        m = ValidManifest();
+        m.Actors[0].ImdbId = "tt0000114"; // a title id in a person field
+        Assert.False(ManifestValidator.TryValidate(m, 6420.5, out _));
+    }
+
+    [Fact]
+    public void ControlCharactersInANameAreRejected()
+    {
+        // The overlay renders names as text nodes, so markup is already inert —
+        // but a bidi override still makes a name display as something other than
+        // what was stored.
+        foreach (var name in new[] { "SteveBuscemi", "Steve‮imecsuB", "Steve​Buscemi" })
+        {
+            var m = ValidManifest();
+            m.Actors[0].Name = name;
+            Assert.False(ManifestValidator.TryValidate(m, 6420.5, out _));
+        }
+    }
+
+    [Fact]
+    public void RealNamesAreAccepted()
+    {
+        foreach (var name in new[] { "Steve Buscemi", "Renée Zellweger", "宮崎 駿", "O'Brien" })
+        {
+            var m = ValidManifest();
+            m.Actors[0].Name = name;
+            Assert.True(ManifestValidator.TryValidate(m, 6420.5, out var error), $"{name}: {error}");
+        }
+    }
+
+    [Fact]
+    public void DuplicateActorsAreRejected()
+    {
+        var m = ValidManifest();
+        var dup = new JmanifestActor { Name = "Steve Buscemi", TmdbId = "884" };
+        dup.Scenes.Add(new JmanifestScene { Start = 1, End = 2 });
+        m.Actors.Add(dup);
+        Assert.False(ManifestValidator.TryValidate(m, 6420.5, out _));
+    }
+
+    // -----------------------------------------------------------------------
+    // Offset application
+    // -----------------------------------------------------------------------
+
+    [Fact]
+    public void TheOffsetIsAppliedToEveryWindow()
+    {
+        // Applied once, at store time, so the stored truth is always in the
+        // local file's timebase and no reader needs offset awareness.
+        var m = ValidManifest();
+        m.Actors[0].Scenes.Clear();
+        m.Actors[0].Scenes.Add(new JmanifestScene { Start = 100, End = 120 });
+        m.Actors[0].Scenes.Add(new JmanifestScene { Start = 200, End = 220 });
+
+        var truth = ManifestConverter.ToTruthFile(m, 40, "/media/film.mkv");
+
+        Assert.Equal(new[] { 140.0, 160.0 }, truth.Actors[0].Scenes[0]);
+        Assert.Equal(new[] { 240.0, 260.0 }, truth.Actors[0].Scenes[1]);
+    }
+
+    [Fact]
+    public void ANegativeOffsetCannotPushAWindowBelowZero()
+    {
+        // A start before the file begins is not indexable by any reader.
+        var m = ValidManifest();
+        m.Actors[0].Scenes.Clear();
+        m.Actors[0].Scenes.Add(new JmanifestScene { Start = 5, End = 20 });
+
+        var truth = ManifestConverter.ToTruthFile(m, -40, "/media/film.mkv");
+
+        Assert.Equal(0.0, truth.Actors[0].Scenes[0][0]);
+        Assert.True(truth.Actors[0].Scenes[0][1] >= truth.Actors[0].Scenes[0][0]);
+    }
+
+    [Fact]
+    public void WindowsAreShiftedNeverReshaped()
+    {
+        // A window is a claim about scene membership (SR-002), so merging
+        // adjacent windows would answer a different question than the pipeline
+        // answered — "was a face visible" rather than "was the actor present".
+        var m = ValidManifest();
+        m.Actors[0].Scenes.Clear();
+        m.Actors[0].Scenes.Add(new JmanifestScene { Start = 10, End = 20 });
+        m.Actors[0].Scenes.Add(new JmanifestScene { Start = 20, End = 30 });
+
+        var truth = ManifestConverter.ToTruthFile(m, 0, "/media/film.mkv");
+
+        Assert.Equal(2, truth.Actors[0].Scenes.Count);
+        Assert.Equal(new[] { 10.0, 20.0 }, truth.Actors[0].Scenes[0]);
+        Assert.Equal(new[] { 20.0, 30.0 }, truth.Actors[0].Scenes[1]);
+    }
+
+    [Fact]
+    public void ALooseMatchSurfacesACaveat()
+    {
+        // Applied as a caveat rather than silently: the runtimes differ by up to
+        // 30 seconds, which is usually a different trim of the same cut but is
+        // not guaranteed to be.
+        Assert.NotNull(ManifestConverter.DescribeCaveat(MatchTier.Loose, 0));
+        Assert.NotNull(ManifestConverter.DescribeCaveat(MatchTier.Audio, 40));
+        Assert.Null(ManifestConverter.DescribeCaveat(MatchTier.Runtime, 0));
+    }
+}

Jellyfin.Plugin.JRay.Tests/PolicyResolverTests.cs

@@ -0,0 +1,85 @@
+using System;
+using System.Collections.Generic;
+using Jellyfin.Plugin.JRay.Models;
+using Jellyfin.Plugin.JRay.Services;
+using Xunit;
+
+namespace Jellyfin.Plugin.JRay.Tests;
+
+/// <summary>
+/// JR-016 — prioritise/ignore rules resolve by specificity: Item beats Series
+/// beats Genre. A scope+value holds only one action, so the only conflicts
+/// possible are across scopes, and that is exactly what these cover.
+///
+/// TRACES: UT-007, UT-008, UT-009, UT-010, UT-011 | JR-016
+/// </summary>
+public class PolicyResolverTests
+{
+    private static readonly Guid ItemId = Guid.Parse("11111111-1111-1111-1111-111111111111");
+    private static readonly Guid SeriesId = Guid.Parse("22222222-2222-2222-2222-222222222222");
+
+    private static MediaPolicyRule Rule(PolicyScope scope, string value, PolicyAction action)
+        => new() { Scope = scope, Value = value, Action = action };
+
+    // UT-007
+    [Fact]
+    public void Resolve_WithNoMatchingRule_ReturnsNull()
+    {
+        var rules = new List<MediaPolicyRule> { Rule(PolicyScope.Genre, "Anime", PolicyAction.Ignore) };
+
+        Assert.Null(PolicyResolver.Resolve(rules, ItemId, SeriesId, new[] { "Drama" }));
+    }
+
+    // UT-008
+    [Fact]
+    public void Resolve_ItemRuleBeatsSeriesRule()
+    {
+        var rules = new List<MediaPolicyRule>
+        {
+            Rule(PolicyScope.Series, SeriesId.ToString("D"), PolicyAction.Ignore),
+            Rule(PolicyScope.Item, ItemId.ToString("D"), PolicyAction.Prioritise),
+        };
+
+        Assert.Equal(PolicyAction.Prioritise, PolicyResolver.Resolve(rules, ItemId, SeriesId, Array.Empty<string>()));
+    }
+
+    // UT-009
+    [Fact]
+    public void Resolve_PrioritisedSeriesInsideIgnoredGenre_SeriesWins()
+    {
+        // The case that motivated specificity resolution: an admin ignores a
+        // whole genre but wants one series out of it anyway. If genre won, the
+        // more specific instruction would be silently discarded.
+        var rules = new List<MediaPolicyRule>
+        {
+            Rule(PolicyScope.Genre, "Anime", PolicyAction.Ignore),
+            Rule(PolicyScope.Series, SeriesId.ToString("D"), PolicyAction.Prioritise),
+        };
+
+        Assert.Equal(PolicyAction.Prioritise, PolicyResolver.Resolve(rules, ItemId, SeriesId, new[] { "Anime" }));
+    }
+
+    // UT-010
+    [Fact]
+    public void Resolve_GenreMatchIsCaseInsensitive()
+    {
+        var rules = new List<MediaPolicyRule> { Rule(PolicyScope.Genre, "anime", PolicyAction.Ignore) };
+
+        Assert.Equal(PolicyAction.Ignore, PolicyResolver.Resolve(rules, ItemId, SeriesId, new[] { "AnImE" }));
+    }
+
+    // UT-011
+    [Fact]
+    public void Resolve_SeriesRuleDoesNotMatchNonEpisode()
+    {
+        // A movie carries Guid.Empty as its series id. A series rule whose value
+        // happened to be an empty GUID must not swallow every movie in the
+        // library.
+        var rules = new List<MediaPolicyRule>
+        {
+            Rule(PolicyScope.Series, Guid.Empty.ToString("D"), PolicyAction.Ignore),
+        };
+
+        Assert.Null(PolicyResolver.Resolve(rules, ItemId, Guid.Empty, Array.Empty<string>()));
+    }
+}

Jellyfin.Plugin.JRay.Tests/PresenceLookupTests.cs

@@ -0,0 +1,150 @@
+using System.Diagnostics;
+using System.Linq;
+using System.Text.Json;
+using Jellyfin.Plugin.JRay.Models;
+using Jellyfin.Plugin.JRay.Services;
+using Xunit;
+
+namespace Jellyfin.Plugin.JRay.Tests;
+
+/// <summary>
+/// JR-004 (windows are scene-membership claims, served verbatim), JR-005 (query
+/// semantics and inclusive bounds) and JR-006 (numerous windows).
+///
+/// These pin the semantics SR-002 sets. The failure they exist to prevent is a
+/// well-meaning "tidy-up" — merging adjacent windows, trimming a zero-length
+/// one, or collapsing overlaps — each of which silently answers a different
+/// question from the one the truth file asked.
+///
+/// TRACES: UT-016, UT-017, UT-018, UT-019, UT-020, UT-021, UT-022, UT-023 | JR-004, JR-005, JR-006
+/// </summary>
+public class PresenceLookupTests
+{
+    private static TruthActor Actor(params double[][] windows)
+    {
+        var actor = new TruthActor { Name = "Steve Buscemi", TmdbId = "884" };
+        foreach (var w in windows)
+        {
+            actor.Scenes.Add(w);
+        }
+
+        return actor;
+    }
+
+    // UT-016
+    [Theory]
+    [InlineData(12.0)]   // exactly the start
+    [InlineData(30.0)]   // inside
+    [InlineData(45.0)]   // exactly the end
+    public void IsPresentAt_WithinInclusiveBounds_IsPresent(double t)
+    {
+        // Both ends inclusive: a window is [start, end], not [start, end).
+        Assert.True(PresenceLookup.IsPresentAt(Actor([12.0, 45.0]), t));
+    }
+
+    // UT-017
+    [Theory]
+    [InlineData(11.999)]
+    [InlineData(45.001)]
+    public void IsPresentAt_OutsideBounds_IsAbsent(double t)
+    {
+        Assert.False(PresenceLookup.IsPresentAt(Actor([12.0, 45.0]), t));
+    }
+
+    // UT-018
+    [Fact]
+    public void IsPresentAt_ZeroLengthWindow_IsPresentAtThatInstant()
+    {
+        // A single sighting is a legitimate window. Discarding it as degenerate
+        // would drop the actor from a scene they are demonstrably in.
+        Assert.True(PresenceLookup.IsPresentAt(Actor([30.0, 30.0]), 30.0));
+    }
+
+    // UT-019
+    [Fact]
+    public void IsPresentAt_OverlappingWindows_IsPresentInsideTheEnclosingOne()
+    {
+        // [0,100] encloses [50,60]. A lookup that assumed non-overlapping,
+        // sorted windows and stopped at the first start > t would miss t = 80.
+        Assert.True(PresenceLookup.IsPresentAt(Actor([0.0, 100.0], [50.0, 60.0]), 80.0));
+    }
+
+    // UT-020
+    [Fact]
+    public void IsPresentAt_UnsortedWindows_StillFindsPresence()
+    {
+        // Sortedness is a producer guarantee, not something correctness may
+        // depend on. A file that violates it must still be read correctly.
+        var actor = Actor([100.0, 110.0], [10.0, 20.0]);
+
+        Assert.True(PresenceLookup.IsPresentAt(actor, 15.0));
+        Assert.False(PresenceLookup.WindowsAreSorted(actor));
+    }
+
+    // UT-021
+    [Fact]
+    public void ActorsPresentAt_AdjacentWindowsAreNeverMerged()
+    {
+        // [0,10] and [10,20] look mergeable. They must not be merged: two
+        // windows mean a genuine departure and return, and the plugin does not
+        // reinterpret that claim. The actor is reported once, from two windows.
+        var truth = new TruthFile();
+        truth.Actors.Add(Actor([0.0, 10.0], [10.0, 20.0]));
+
+        Assert.Single(PresenceLookup.ActorsPresentAt(truth, 10.0));
+        Assert.Equal(2, truth.Actors[0].Scenes.Count);
+    }
+
+    // UT-022
+    [Fact]
+    public void TruthFile_RoundTrips_WithWindowsByteIdentical()
+    {
+        // JR-004: served exactly as given. A round trip through the serializer
+        // is where a silent normalisation would show up.
+        const string Json = """
+        {"schema_version":1,"movie":"/m.mkv","sample_fps":1,"anneal_sec":2,
+         "actors":[{"name":"A","imdb_id":"","tmdb_id":"884","jellyfin_id":"",
+                    "scenes":[[0.0,10.0],[10.0,20.0],[30.0,30.0]]}]}
+        """;
+
+        var parsed = JsonSerializer.Deserialize<TruthFile>(Json, new JsonSerializerOptions(JsonSerializerDefaults.Web))!;
+        var windows = parsed.Actors[0].Scenes;
+
+        Assert.Equal(3, windows.Count);
+        Assert.Equal([0.0, 10.0], windows[0]);
+        Assert.Equal([10.0, 20.0], windows[1]);
+        Assert.Equal([30.0, 30.0], windows[2]);
+    }
+
+    // UT-023
+    [Fact]
+    public void ActorsPresentAt_WithManyWindows_StaysCheapAndBoundsTheResponse()
+    {
+        // SR-002: windows may be numerous; consumers must not assume a handful
+        // of long ones. Track-extent presence with a short re-acquisition
+        // timeout produces many short windows per actor.
+        var truth = new TruthFile();
+        for (var a = 0; a < 50; a++)
+        {
+            var actor = Actor();
+            for (var w = 0; w < 1000; w++)
+            {
+                actor.Scenes.Add([w * 10.0, (w * 10.0) + 4.0]);
+            }
+
+            truth.Actors.Add(actor);
+        }
+
+        var sw = Stopwatch.StartNew();
+        var present = PresenceLookup.ActorsPresentAt(truth, 5002.0).ToList();
+        sw.Stop();
+
+        // The response is bounded by actor count, never by window count — which
+        // is what keeps `jray?t=` small however finely presence is sliced.
+        Assert.Equal(50, present.Count);
+
+        // 50 000 windows scanned. Generous bound: this asserts the read path is
+        // not accidentally quadratic, not a precise budget on a shared runner.
+        Assert.True(sw.ElapsedMilliseconds < 250, $"lookup took {sw.ElapsedMilliseconds} ms");
+    }
+}

Jellyfin.Plugin.JRay.Tests/WebClientPatchServiceTests.cs

@@ -0,0 +1,92 @@
+using Jellyfin.Plugin.JRay.Services;
+using Xunit;
+
+namespace Jellyfin.Plugin.JRay.Tests;
+
+/// <summary>
+/// JR-022 — an earlier JRay injected its overlay script into index.html on
+/// disk. Those users must not be left with a stale injection pointing at
+/// endpoints that have since changed, so removal survives even though JR-021
+/// deleted the injection that created it.
+///
+/// Removal keys on JRay's own marker. The cases that matter are the ones where
+/// it could reach too far: another plugin's injection, or a script tag that
+/// looks like JRay's but carries no marker.
+///
+/// TRACES: UT-001, UT-002, UT-003, UT-004, UT-005 | JR-022
+/// </summary>
+public class WebClientPatchServiceTests
+{
+    private const string Marker = "<!-- jray-overlay -->";
+    private const string ScriptTag = "<script defer src=\"/Plugins/JRay/ClientScript\"></script>";
+
+    // UT-001
+    [Fact]
+    public void RemoveInjection_WithMarkedTagAndNewline_RestoresOriginalBytes()
+    {
+        var original = "<html><body><div>x</div>\n</body></html>";
+        var patched = "<html><body><div>x</div>\n" + ScriptTag + Marker + "\n</body></html>";
+
+        // The trailing newline goes with the tag. If it did not, every
+        // install/uninstall cycle would leave another blank line behind.
+        Assert.Equal(original, WebClientPatchService.RemoveInjection(patched));
+    }
+
+    // UT-002
+    [Fact]
+    public void RemoveInjection_WithMarkedTagAndNoNewline_RemovesTag()
+    {
+        var patched = "<html><body>" + ScriptTag + Marker + "</body></html>";
+
+        Assert.Equal("<html><body></body></html>", WebClientPatchService.RemoveInjection(patched));
+    }
+
+    // UT-003
+    [Fact]
+    public void RemoveInjection_WithNoMarker_LeavesDocumentUnchanged()
+    {
+        var clean = "<html><body><div>x</div>\n</body></html>";
+
+        Assert.Equal(clean, WebClientPatchService.RemoveInjection(clean));
+    }
+
+    // UT-004
+    [Fact]
+    public void RemoveInjection_IsIdempotent()
+    {
+        var patched = "<html><body>" + ScriptTag + Marker + "\n</body></html>";
+
+        var once = WebClientPatchService.RemoveInjection(patched);
+        var twice = WebClientPatchService.RemoveInjection(once);
+
+        // Startup calls this unconditionally, so it runs on every boot forever
+        // after the patch is gone.
+        Assert.Equal(once, twice);
+    }
+
+    // UT-005
+    [Fact]
+    public void RemoveInjection_LeavesAnotherPluginsInjectionIntact()
+    {
+        var foreign = "<script defer src=\"/Plugins/Other/Script\"></script><!-- other-overlay -->";
+        var patched = "<html><body>" + foreign + ScriptTag + Marker + "\n</body></html>";
+
+        var cleaned = WebClientPatchService.RemoveInjection(patched);
+
+        // The marker is what makes removal unambiguous. Removing anything we did
+        // not add is the failure this guards: it is another plugin's file too.
+        Assert.Contains(foreign, cleaned, System.StringComparison.Ordinal);
+        Assert.DoesNotContain(Marker, cleaned, System.StringComparison.Ordinal);
+    }
+
+    // UT-006
+    [Fact]
+    public void RemoveInjection_WithUnmarkedLookalikeTag_LeavesItAlone()
+    {
+        // Same script tag, no marker: JRay did not write this, so JRay does not
+        // remove it.
+        var patched = "<html><body>" + ScriptTag + "\n</body></html>";
+
+        Assert.Equal(patched, WebClientPatchService.RemoveInjection(patched));
+    }
+}

Jellyfin.Plugin.JRay.sln

@@ -1,7 +1,9 @@
+
 Microsoft Visual Studio Solution File, Format Version 12.00
-#
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Jellyfin.Plugin.JRay", "Jellyfin.Plugin.JRay\Jellyfin.Plugin.JRay.csproj", "{D921B930-CF91-406F-ACBC-08914DCD0D34}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Jellyfin.Plugin.JRay.Tests", "Jellyfin.Plugin.JRay.Tests\Jellyfin.Plugin.JRay.Tests.csproj", "{104C1021-3155-4404-9CA0-8ED8F310A152}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -12,7 +14,7 @@ Global
 		Release|x86 = Release|x86
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-        {D921B930-CF91-406F-ACBC-08914DCD0D34}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D921B930-CF91-406F-ACBC-08914DCD0D34}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{D921B930-CF91-406F-ACBC-08914DCD0D34}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{D921B930-CF91-406F-ACBC-08914DCD0D34}.Debug|x64.ActiveCfg = Debug|Any CPU
 		{D921B930-CF91-406F-ACBC-08914DCD0D34}.Debug|x64.Build.0 = Debug|Any CPU
@@ -24,5 +26,20 @@ Global
 		{D921B930-CF91-406F-ACBC-08914DCD0D34}.Release|x64.Build.0 = Release|Any CPU
 		{D921B930-CF91-406F-ACBC-08914DCD0D34}.Release|x86.ActiveCfg = Release|Any CPU
 		{D921B930-CF91-406F-ACBC-08914DCD0D34}.Release|x86.Build.0 = Release|Any CPU
+		{104C1021-3155-4404-9CA0-8ED8F310A152}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{104C1021-3155-4404-9CA0-8ED8F310A152}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{104C1021-3155-4404-9CA0-8ED8F310A152}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{104C1021-3155-4404-9CA0-8ED8F310A152}.Debug|x64.Build.0 = Debug|Any CPU
+		{104C1021-3155-4404-9CA0-8ED8F310A152}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{104C1021-3155-4404-9CA0-8ED8F310A152}.Debug|x86.Build.0 = Debug|Any CPU
+		{104C1021-3155-4404-9CA0-8ED8F310A152}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{104C1021-3155-4404-9CA0-8ED8F310A152}.Release|Any CPU.Build.0 = Release|Any CPU
+		{104C1021-3155-4404-9CA0-8ED8F310A152}.Release|x64.ActiveCfg = Release|Any CPU
+		{104C1021-3155-4404-9CA0-8ED8F310A152}.Release|x64.Build.0 = Release|Any CPU
+		{104C1021-3155-4404-9CA0-8ED8F310A152}.Release|x86.ActiveCfg = Release|Any CPU
+		{104C1021-3155-4404-9CA0-8ED8F310A152}.Release|x86.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
 	EndGlobalSection
 EndGlobal

Jellyfin.Plugin.JRay/Configuration/ManifestServer.cs

@@ -0,0 +1,129 @@
+namespace Jellyfin.Plugin.JRay.Configuration;
+
+/// <summary>
+/// How far a configured manifest server is trusted. See the JRay public server
+/// specification, §9 "Trusting third-party servers".
+/// </summary>
+public enum ServerTrustLevel
+{
+    /// <summary>
+    /// Accept manifests, but never contribute to this server and never send
+    /// library inventory beyond the single item being queried. The default for
+    /// user-added servers.
+    /// </summary>
+    FetchOnly = 0,
+
+    /// <summary>
+    /// Eligible to contribute to, subject to <see cref="ManifestServer.AllowContribute"/>.
+    /// </summary>
+    Full = 1,
+}
+
+/// <summary>
+/// The minimum cut-match tier a fetched manifest must reach before it is stored.
+/// See the public server specification, §3 "Cut matching".
+/// </summary>
+/// <remarks>
+/// Every tier is a claim about a <em>cut</em>, never about a copy. There is no
+/// file-level tier, and the plugin sends no <c>video_hash</c>.
+/// <para>
+/// <b>The <c>Exact</c> tier was withdrawn for legal reasons; do not re-add it
+/// without an explicit, recorded agreement.</b> It keyed on the OpenSubtitles
+/// file hash, which identifies the individual encode a user holds rather than
+/// the edit the timings describe. A TMDB id discloses "some copy of this film";
+/// a file hash discloses "<em>this exact release</em>", which turns a catalogue
+/// lookup into a release-identification service and turns the server's database
+/// into a mapping from file fingerprints to the instances holding them. That is
+/// a far more specific disclosure than PR-005 permits, and a dataset no
+/// volunteer operator should be holding.
+/// </para>
+/// <para>
+/// The audio signature is the deliberate replacement: derived from content, it
+/// identifies the <em>cut</em>, so two different encodes of the same edit agree.
+/// It answers the question the exchange needs — "do these timings apply to this
+/// media?" — without answering the one it must not. <c>Audio</c> is therefore
+/// the top tier here.
+/// </para>
+/// </remarks>
+public enum MatchTier
+{
+    /// <summary>Audio 0.60–0.85, or runtimes within ±30s. Surfaced as a caveat in the UI.</summary>
+    Loose = 0,
+
+    /// <summary>Runtimes within ±2s.</summary>
+    Runtime = 1,
+
+    /// <summary>Audio signature score ≥ 0.85; may carry a non-zero offset. The top tier.</summary>
+    Audio = 2,
+}
+
+/// <summary>
+/// One entry in the ordered list of manifest servers the plugin queries
+/// (public server specification, §9 "Multiple servers").
+/// </summary>
+/// <remarks>
+/// The list is ordered because order *is* the user's trust ranking, made
+/// explicit: for a fetch, servers are tried in order and the first acceptable
+/// result wins. Querying every server for every item would multiply egress and
+/// leak the library to more parties.
+///
+/// <c>FetchOnly</c> is the default for user-added servers. Adding a third-party
+/// server means trusting its operator not to serve deliberately wrong actor
+/// data — the client-side controls bound the damage to bad overlay content,
+/// they cannot make wrong data right.
+/// </remarks>
+// TRACES: JR-025 | PR-005, PR-006
+public class ManifestServer
+{
+    /// <summary>
+    /// Initializes a new instance of the <see cref="ManifestServer"/> class.
+    /// </summary>
+    public ManifestServer()
+    {
+        Url = string.Empty;
+        Name = string.Empty;
+        Token = string.Empty;
+        Enabled = false;
+        AllowContribute = false;
+        TrustLevel = ServerTrustLevel.FetchOnly;
+    }
+
+    /// <summary>
+    /// Gets or sets the base URL of the server, e.g. "https://jray.tourolle.paris".
+    /// HTTPS is required for non-loopback servers: a plaintext server would let
+    /// any network intermediary rewrite actor overlays.
+    /// </summary>
+    public string Url { get; set; }
+
+    /// <summary>
+    /// Gets or sets the display label shown in the configuration page.
+    /// </summary>
+    public string Name { get; set; }
+
+    /// <summary>
+    /// Gets or sets the API token used to contribute manifests. Optional —
+    /// required only to contribute, never to fetch. This is an anonymous bearer
+    /// capability rather than an account (public server specification, §5a).
+    /// </summary>
+    public string Token { get; set; }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether this server is queried at all.
+    /// Lets an admin disable an entry without deleting it and losing its token.
+    /// </summary>
+    public bool Enabled { get; set; }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether locally generated manifests may be
+    /// contributed to this server. Independent of fetching, and off by default:
+    /// contribution is never fanned out, because broadcasting uploads to every
+    /// configured server would multiply privacy exposure without the user
+    /// intending it.
+    /// </summary>
+    public bool AllowContribute { get; set; }
+
+    /// <summary>
+    /// Gets or sets how far this server is trusted.
+    /// </summary>
+    public ServerTrustLevel TrustLevel { get; set; }
+}

Jellyfin.Plugin.JRay/Configuration/PluginConfiguration.cs

@@ -1,3 +1,4 @@
+using System.Collections.ObjectModel;
 using MediaBrowser.Model.Plugins;
 
 namespace Jellyfin.Plugin.JRay.Configuration;
@@ -5,8 +6,28 @@ namespace Jellyfin.Plugin.JRay.Configuration;
 /// <summary>
 /// Plugin configuration.
 /// </summary>
+/// <remarks>
+/// Every manifest-exchange switch here defaults to <b>off</b>, including the
+/// pre-configured community server, so no traffic leaves an installation until
+/// an admin acts. Fetching and contributing each reveal to a server operator
+/// that some instance holds a given title; that is inherent to the exchange, so
+/// the defaults bound the exposure rather than pretending to remove it.
+/// </remarks>
+// TRACES: JR-036, JR-038 | PR-005
 public class PluginConfiguration : BasePluginConfiguration
 {
+    /// <summary>
+    /// The community manifest exchange. Shipped pre-configured but
+    /// <b>disabled</b>, so no traffic leaves an installation until an admin opts
+    /// in (public server specification, §9).
+    /// </summary>
+    public const string CommunityServerUrl = "https://jray.tourolle.paris";
+
+    /// <summary>
+    /// Display name for <see cref="CommunityServerUrl"/>.
+    /// </summary>
+    public const string CommunityServerName = "JRay Community";
+
     /// <summary>
     /// Initializes a new instance of the <see cref="PluginConfiguration"/> class.
     /// </summary>
@@ -15,6 +36,24 @@ public class PluginConfiguration : BasePluginConfiguration
         TruthFileSuffix = ".jray.json";
         CacheDurationMinutes = 60;
         EnableOverlay = true;
+
+        // Manifest sharing is a network egress feature, so every part of it is
+        // off by default (public server specification, §9 "Configuration").
+        EnableManifestSharing = false;
+        ContributeManifests = false;
+        ComputeAudioSignatures = false;
+        MinimumMatchTier = MatchTier.Runtime;
+
+        // Pre-configured but disabled: the admin opts in by enabling it, rather
+        // than by having to discover and type a URL.
+        Servers.Add(new ManifestServer
+        {
+            Url = CommunityServerUrl,
+            Name = CommunityServerName,
+            Enabled = false,
+            AllowContribute = false,
+            TrustLevel = ServerTrustLevel.FetchOnly,
+        });
     }
 
     /// <summary>
@@ -37,4 +76,62 @@ public class PluginConfiguration : BasePluginConfiguration
     /// any previously injected script is removed.
     /// </summary>
     public bool EnableOverlay { get; set; }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether JRay may fetch actor-timeline
+    /// manifests from the configured servers. Off by default — this is a network
+    /// egress feature and must be opt-in.
+    /// </summary>
+    /// <remarks>
+    /// Fetching reveals to a server operator that some instance holds a given
+    /// title. That is inherent to the exchange, and each configured server
+    /// multiplies the exposure, which the configuration page states plainly.
+    /// </remarks>
+    public bool EnableManifestSharing { get; set; }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether locally generated manifests may be
+    /// contributed back. A separate opt-in from downloading, and off by default.
+    /// </summary>
+    /// <remarks>
+    /// Contribution additionally requires <see cref="ManifestServer.AllowContribute"/>
+    /// on the specific server and a token for it. Uploads are never fanned out to
+    /// every configured server.
+    /// </remarks>
+    public bool ContributeManifests { get; set; }
+
+    /// <summary>
+    /// Gets or sets the minimum cut-match tier a fetched manifest must reach
+    /// before it is stored.
+    /// </summary>
+    /// <remarks>
+    /// Defaults to <see cref="MatchTier.Runtime"/>. <see cref="MatchTier.Loose"/>
+    /// admits manifests whose runtime differs by up to 30s, which may be a
+    /// different trim of the same cut — usable, but it should be surfaced as a
+    /// caveat rather than applied silently.
+    /// </remarks>
+    public MatchTier MinimumMatchTier { get; set; }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether the plugin computes audio
+    /// signatures for library items, enabling content-based cut matching and
+    /// identification of files whose providence is unknown.
+    /// </summary>
+    /// <remarks>
+    /// Off by default. Uses the FFmpeg binary Jellyfin already ships (via
+    /// <c>IMediaEncoder.EncoderPath</c>), so there is no extra dependency, but it
+    /// costs roughly a second or two of I/O per item and is therefore opt-in.
+    /// </remarks>
+    public bool ComputeAudioSignatures { get; set; }
+
+    /// <summary>
+    /// Gets the ordered list of manifest servers.
+    /// </summary>
+    /// <remarks>
+    /// Order is the user's trust ranking: for a fetch, servers are tried in order
+    /// and the first result clearing <see cref="MinimumMatchTier"/> wins. For a
+    /// series, first-match applies per <i>episode</i>, so a later server is
+    /// queried only for the episodes earlier ones lacked.
+    /// </remarks>
+    public Collection<ManifestServer> Servers { get; } = new();
 }

Jellyfin.Plugin.JRay/Configuration/configPage.html

@@ -29,10 +29,16 @@
                             <span>Enable pause overlay</span>
                         </label>
                         <div class="fieldDescription">
-                            Injects a small script into the web client that shows on-screen actors
-                            when playback is paused. Disabling this removes the injected script.
+                            Shows the cast of the current scene when playback is paused. This
+                            requires the
+                            <a is="emby-linkbutton" class="button-link" href="https://github.com/IAmParadox27/jellyfin-plugin-file-transformation" target="_blank" rel="noopener">File Transformation</a>
+                            plugin, which rewrites the web client's index.html as it is served.
+                            JRay never modifies index.html on disk, so there is no fallback if
+                            that plugin is absent — only the overlay is affected, and every
+                            other JRay feature keeps working.
                         </div>
                     </div>
+                    <div id="JRayDependencyStatus" class="fieldDescription" style="margin:0 0 1.5em;padding:0.75em 1em;border-radius:0.25em;display:none;"></div>
                     <div>
                         <button is="emby-button" type="submit" class="raised button-submit block emby-button">
                             <span>Save</span>
@@ -131,6 +137,32 @@
                     .replace(/>/g, '&gt;').replace(/"/g, '&quot;');
             }
 
+            // ---- Dependency status ----
+            // Jellyfin cannot install a plugin's dependency, so the only thing
+            // that closes the gap is saying so where an admin can act on it.
+            function loadDependencyStatus() {
+                var el = document.querySelector('#JRayDependencyStatus');
+                return jrayApi('Status/Dependencies').then(function (status) {
+                    el.style.display = '';
+                    if (status.file_transformation_available) {
+                        el.style.background = 'rgba(82,168,82,0.15)';
+                        el.innerHTML = '<strong>File Transformation detected.</strong> '
+                            + 'The pause overlay is served by rewriting index.html as it is '
+                            + 'sent, leaving the file on disk untouched.';
+                        return;
+                    }
+
+                    el.style.background = 'rgba(220,160,60,0.18)';
+                    el.innerHTML = '<strong>File Transformation is not installed &mdash; the pause '
+                        + 'overlay is disabled.</strong> Every other JRay feature is unaffected. '
+                        + 'To enable it, add this repository in Dashboard &rarr; Plugins &rarr; '
+                        + 'Repositories, then install "File Transformation" and restart:<br />'
+                        + '<code>' + escapeHtml(status.file_transformation_manifest_url) + '</code>';
+                }).catch(function () {
+                    el.style.display = 'none';
+                });
+            }
+
             // ---- Coverage ----
 
             var JRayCoverColors = {
@@ -340,6 +372,7 @@
                         Dashboard.hideLoadingMsg();
                     });
 
+                    loadDependencyStatus();
                     populateValueSelect();
                     loadRules();
                     loadCoverage();

Jellyfin.Plugin.JRay/Controllers/ActorsController.cs

@@ -1,8 +1,8 @@
 using System;
-using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using Jellyfin.Plugin.JRay.Models;
+using Jellyfin.Plugin.JRay.Services;
 using Jellyfin.Plugin.JRay.Services.Interfaces;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Http;
@@ -11,12 +11,19 @@ using Microsoft.AspNetCore.Mvc;
 namespace Jellyfin.Plugin.JRay.Controllers;
 
 /// <summary>
-/// Exposes scene-actor-extraction "truth" data: which actors are on screen
-/// at a given timestamp in a movie.
+/// Exposes scene-actor-extraction "truth" data: which actors are present in
+/// the scene at a given timestamp.
 /// </summary>
+/// <remarks>
+/// Presence is <b>scene-scoped</b>, not instantaneous: a window is a claim about
+/// scene membership, not a recognition event, so an actor who is off-camera
+/// during a reverse shot is still present. Windows are served exactly as stored
+/// — never merged, split or trimmed.
+/// </remarks>
 [ApiController]
 [Route("Plugins/JRay/Items/{itemId}")]
 [Authorize]
+// TRACES: JR-004, JR-005, JR-010, JR-012, JR-013, JR-014 | SR-002
 public class ActorsController : ControllerBase
 {
     private readonly ITruthDataService _truthDataService;
@@ -31,7 +38,7 @@ public class ActorsController : ControllerBase
     }
 
     /// <summary>
-    /// Gets the full actor timeline (every actor with their on-screen scene windows) for a movie.
+    /// Gets the full actor timeline (every actor with their scene-presence windows) for a movie.
     /// </summary>
     /// <param name="itemId">The Jellyfin item id.</param>
     /// <param name="cancellationToken">Cancellation token.</param>
@@ -51,7 +58,26 @@ public class ActorsController : ControllerBase
     }
 
     /// <summary>
-    /// Gets the JRay context (currently: on-screen actors) at a given timestamp.
+    /// Gets how this item's truth data was obtained.
+    /// </summary>
+    /// <remarks>
+    /// Separate from <c>Timeline</c> on purpose: provenance is metadata *about*
+    /// the claim, and folding it into the truth file would mean the bytes served
+    /// back are not the bytes the producer wrote (JR-004).
+    /// </remarks>
+    /// <param name="itemId">The Jellyfin item id.</param>
+    /// <returns>The provenance, or 404 if no truth data exists for this item.</returns>
+    [HttpGet("Provenance")]
+    [ProducesResponseType(StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public ActionResult<TruthProvenance> GetProvenance(Guid itemId)
+    {
+        var provenance = _truthDataService.GetProvenance(itemId);
+        return provenance is null ? NotFound() : Ok(provenance);
+    }
+
+    /// <summary>
+    /// Gets the JRay context (currently: the actors in the scene) at a given timestamp.
     /// This is an extensible envelope — future fields (locations, trivia, etc.)
     /// will be added here without changing the route.
     /// </summary>
@@ -71,9 +97,9 @@ public class ActorsController : ControllerBase
         }
 
         var context = new JRayContext();
-        foreach (var actor in truth.Actors.Where(actor => actor.Scenes.Any(scene => scene.Length == 2 && scene[0] <= t && t <= scene[1])))
+        foreach (var actor in PresenceLookup.ActorsPresentAt(truth, t))
         {
-            context.Actors.Add(new ActorAtTime
+            context.Actors.Add(new ActorInScene
             {
                 Name = actor.Name,
                 ImdbId = actor.ImdbId,

Jellyfin.Plugin.JRay/Controllers/CoverageController.cs

@@ -19,9 +19,15 @@ namespace Jellyfin.Plugin.JRay.Controllers;
 /// by genre), and supplies the genre/series option lists the config page's
 /// rule editor needs.
 /// </summary>
+/// <remarks>
+/// Percent done is <c>covered / (total - ignored)</c>: ignored items are
+/// intentionally out of scope, so excluding a genre must not drag the figure
+/// down as though it were outstanding work.
+/// </remarks>
 [ApiController]
 [Route("Plugins/JRay/Coverage")]
 [Authorize(Roles = "Administrator")]
+// TRACES: JR-018, JR-019 | PR-003
 public class CoverageController : ControllerBase
 {
     private readonly ILibraryManager _libraryManager;
@@ -64,7 +70,7 @@ public class CoverageController : ControllerBase
 
         foreach (var item in items)
         {
-            if (string.IsNullOrEmpty(item.Path))
+            if (!TasksController.MediaFileExists(item))
             {
                 continue;
             }

Jellyfin.Plugin.JRay/Controllers/ManifestController.cs

@@ -0,0 +1,200 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Jellyfin.Plugin.JRay.Configuration;
+using Jellyfin.Plugin.JRay.Models;
+using Jellyfin.Plugin.JRay.Services;
+using Jellyfin.Plugin.JRay.Services.Interfaces;
+using MediaBrowser.Common.Api;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Entities.TV;
+using MediaBrowser.Controller.Library;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Logging;
+
+namespace Jellyfin.Plugin.JRay.Controllers;
+
+/// <summary>
+/// Fetches actor-timeline manifests from the configured public servers.
+/// </summary>
+// TRACES: JR-025, JR-031 | PR-006
+[ApiController]
+[Authorize(Policy = Policies.RequiresElevation)]
+[Route("Plugins/JRay")]
+[Produces("application/json")]
+public class ManifestController : ControllerBase
+{
+    private readonly ILibraryManager _libraryManager;
+    private readonly IManifestExchangeClient _exchange;
+    private readonly IManagedTruthStore _truthStore;
+    private readonly ILogger<ManifestController> _logger;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="ManifestController"/> class.
+    /// </summary>
+    /// <param name="libraryManager">Library manager.</param>
+    /// <param name="exchange">Manifest exchange client.</param>
+    /// <param name="truthStore">Managed truth store.</param>
+    /// <param name="logger">Logger.</param>
+    public ManifestController(
+        ILibraryManager libraryManager,
+        IManifestExchangeClient exchange,
+        IManagedTruthStore truthStore,
+        ILogger<ManifestController> logger)
+    {
+        _libraryManager = libraryManager;
+        _exchange = exchange;
+        _truthStore = truthStore;
+        _logger = logger;
+    }
+
+    /// <summary>
+    /// Resolves an item across the configured servers and stores the first
+    /// acceptable manifest.
+    /// </summary>
+    /// <param name="itemId">The library item id.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>What was fetched, and from where.</returns>
+    /// <response code="200">A manifest was stored.</response>
+    /// <response code="404">The item does not exist, or no server had a manifest for it.</response>
+    /// <response code="409">Manifest sharing is disabled in the plugin configuration.</response>
+    [HttpPost("Items/{itemId}/Fetch")]
+    [ProducesResponseType(StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    public async Task<ActionResult<ManifestFetchResult>> FetchItem(
+        [FromRoute] Guid itemId,
+        CancellationToken cancellationToken)
+    {
+        var config = Plugin.Instance?.Configuration;
+        if (config is null || !config.EnableManifestSharing)
+        {
+            // Off by default and opt-in: this is a network egress feature, so it
+            // never runs merely because an endpoint was called.
+            return Conflict(new { error = "manifest sharing is disabled" });
+        }
+
+        var item = _libraryManager.GetItemById(itemId);
+        if (item is null)
+        {
+            return NotFound();
+        }
+
+        var query = BuildQuery(item);
+        if (query is null)
+        {
+            return NotFound(new { error = "item has no TMDB or IMDB id to look up" });
+        }
+
+        var servers = config.Servers.ToList();
+        var outcome = item is Episode
+            ? await _exchange.FetchEpisodeAsync(servers, config.MinimumMatchTier, query, cancellationToken)
+                .ConfigureAwait(false)
+            : await _exchange.FetchMovieAsync(servers, config.MinimumMatchTier, query, cancellationToken)
+                .ConfigureAwait(false);
+
+        if (outcome?.Manifest is null)
+        {
+            return NotFound(new { error = "no configured server had an acceptable manifest" });
+        }
+
+        // The offset is applied here, once, so the stored truth is always in the
+        // local file's own timebase and no reader needs offset awareness.
+        var truth = ManifestConverter.ToTruthFile(outcome.Manifest, outcome.OffsetSec, item.Path ?? string.Empty);
+        var provenance = new TruthProvenance
+        {
+            Source = TruthSource.Fetched,
+            ServerUrl = outcome.ServerUrl,
+            MatchTier = outcome.Tier,
+            OffsetSec = outcome.OffsetSec,
+            Caveat = ManifestConverter.DescribeCaveat(outcome.Tier, outcome.OffsetSec),
+            RecordedAt = DateTime.UtcNow,
+        };
+
+        await _truthStore.SaveAsync(itemId, truth, provenance, cancellationToken).ConfigureAwait(false);
+
+        _logger.LogInformation(
+            "Stored manifest for {ItemId} from {Server} at tier {Tier} (offset {Offset}s)",
+            itemId,
+            outcome.ServerUrl,
+            outcome.Tier,
+            outcome.OffsetSec);
+
+        return Ok(new ManifestFetchResult
+        {
+            ServerUrl = outcome.ServerUrl,
+            Match = outcome.Tier.ToString().ToLowerInvariant(),
+            OffsetSec = outcome.OffsetSec,
+            ActorCount = truth.Actors.Count,
+            Caveat = ManifestConverter.DescribeCaveat(outcome.Tier, outcome.OffsetSec),
+        });
+    }
+
+    /// <summary>
+    /// Per-server reachability and last error, for the configuration page.
+    /// </summary>
+    /// <returns>One entry per configured server, in configured order.</returns>
+    /// <response code="200">Status for each configured server.</response>
+    [HttpGet("Servers/Status")]
+    [ProducesResponseType(StatusCodes.Status200OK)]
+    public ActionResult<IReadOnlyList<ServerStatus>> GetServerStatus()
+    {
+        var config = Plugin.Instance?.Configuration;
+        if (config is null)
+        {
+            return Ok(Array.Empty<ServerStatus>());
+        }
+
+        return Ok(_exchange.GetStatus(config.Servers.ToList()));
+    }
+
+    /// <summary>
+    /// Reads a provider id from an item, or null when it is absent.
+    /// </summary>
+    private static string? ProviderId(BaseItem? item, string provider) =>
+        item?.ProviderIds is { } ids && ids.TryGetValue(provider, out var value)
+            && !string.IsNullOrWhiteSpace(value)
+                ? value
+                : null;
+
+    /// <summary>
+    /// Builds the lookup query from an item's provider ids and measured runtime.
+    /// </summary>
+    private static TitleQuery? BuildQuery(BaseItem item)
+    {
+        var runtimeSec = item.RunTimeTicks.HasValue
+            ? TimeSpan.FromTicks(item.RunTimeTicks.Value).TotalSeconds
+            : (double?)null;
+
+        if (item is Episode episode)
+        {
+            var series = episode.Series;
+            var seriesTmdb = ProviderId(series, "Tmdb");
+            if (string.IsNullOrEmpty(seriesTmdb))
+            {
+                return null;
+            }
+
+            return new TitleQuery
+            {
+                SeriesTmdbId = seriesTmdb,
+                Season = episode.ParentIndexNumber,
+                Episode = episode.IndexNumber,
+                RuntimeSec = runtimeSec,
+            };
+        }
+
+        var tmdb = ProviderId(item, "Tmdb");
+        var imdb = ProviderId(item, "Imdb");
+        if (string.IsNullOrEmpty(tmdb) && string.IsNullOrEmpty(imdb))
+        {
+            return null;
+        }
+
+        return new TitleQuery { TmdbId = tmdb, ImdbId = imdb, RuntimeSec = runtimeSec };
+    }
+}

Jellyfin.Plugin.JRay/Controllers/PolicyController.cs

@@ -13,9 +13,15 @@ namespace Jellyfin.Plugin.JRay.Controllers;
 /// series, or a single item; setting a rule for a target that already has one
 /// replaces it, so a target can never be both prioritised and ignored.
 /// </summary>
+/// <remarks>
+/// Rules steer work discovery only. They never reach the read endpoints or the
+/// overlay, because a rule says "don't spend compute here", not "pretend this
+/// item does not exist".
+/// </remarks>
 [ApiController]
 [Route("Plugins/JRay/Policy")]
 [Authorize(Roles = "Administrator")]
+// TRACES: JR-016, JR-014 | PR-003
 public class PolicyController : ControllerBase
 {
     private readonly IMediaPolicyStore _policyStore;

Jellyfin.Plugin.JRay/Controllers/StatusController.cs

@@ -0,0 +1,38 @@
+using Jellyfin.Plugin.JRay.Models;
+using Jellyfin.Plugin.JRay.Services;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Jellyfin.Plugin.JRay.Controllers;
+
+/// <summary>
+/// Reports whether JRay's hard dependency on the File Transformation plugin is
+/// satisfied, for the configuration page to surface.
+/// </summary>
+/// <remarks>
+/// Absent that plugin the pause overlay is disabled and every other JRay feature
+/// continues to work — so this is a status to display, not an error to raise.
+/// </remarks>
+[ApiController]
+[Route("Plugins/JRay/Status")]
+[Authorize(Roles = "Administrator")]
+// TRACES: JR-023 | PR-004
+public class StatusController : ControllerBase
+{
+    /// <summary>
+    /// Gets the dependency status.
+    /// </summary>
+    /// <returns>The dependency status.</returns>
+    [HttpGet("Dependencies")]
+    [ProducesResponseType(StatusCodes.Status200OK)]
+    public ActionResult<DependencyStatus> GetDependencies()
+    {
+        return Ok(new DependencyStatus
+        {
+            FileTransformationAvailable = Plugin.FileTransformationAvailable,
+            OverlayEnabled = Plugin.OverlayEnabled,
+            FileTransformationManifestUrl = FileTransformationRegistration.ManifestUrl,
+        });
+    }
+}

Jellyfin.Plugin.JRay/Controllers/TasksController.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using Jellyfin.Data.Enums;
 using Jellyfin.Plugin.JRay.Models;
@@ -18,9 +19,19 @@ namespace Jellyfin.Plugin.JRay.Controllers;
 /// Lets a remote extraction worker discover which library items still need
 /// to be processed.
 /// </summary>
+/// <remarks>
+/// The sample is random so that repeated polling spreads work across the
+/// backlog without the server tracking who holds what, and so two workers
+/// polling concurrently mostly do not collide.
+///
+/// Prioritise/ignore rules are applied <b>here and only here</b> (JR-017):
+/// they express "don't spend compute on this", not "pretend this does not
+/// exist", so they never reach the read endpoints or the overlay.
+/// </remarks>
 [ApiController]
 [Route("Plugins/JRay/Tasks")]
 [Authorize(Roles = "Administrator")]
+// TRACES: JR-015, JR-017 | PR-003
 public class TasksController : ControllerBase
 {
     private const int DefaultLimit = 10;
@@ -66,7 +77,7 @@ public class TasksController : ControllerBase
         // drop anything ignored, and order prioritised items ahead of the rest.
         // Randomise within each tier so the backlog still spreads across workers.
         var pending = items
-            .Where(item => !string.IsNullOrEmpty(item.Path) && !_truthDataService.HasTruth(item.Id, item.Path))
+            .Where(item => MediaFileExists(item) && !_truthDataService.HasTruth(item.Id, item.Path))
             .Select(item => new
             {
                 Item = item,
@@ -96,4 +107,35 @@ public class TasksController : ControllerBase
     {
         return item is Episode episode ? episode.SeriesId : Guid.Empty;
     }
+
+    /// <summary>
+    /// Determines whether an item's backing media still exists on disk.
+    /// <para>
+    /// A library item can outlive its file: deleting media from disk does not
+    /// always purge the Jellyfin database entry, and such ghosts keep
+    /// <c>IsVirtualItem == false</c>, so filtering on that flag alone is not
+    /// enough. Without this check the pending endpoint hands stale paths/URLs to
+    /// extraction workers, and — because a missing file can never gain truth
+    /// data — those items stay pending forever.
+    /// </para>
+    /// Only local (file-protocol) items are stat-checked; remote/streamed items
+    /// are assumed present so we never stat something off-box.
+    /// </summary>
+    /// <param name="item">The library item.</param>
+    /// <returns><c>true</c> if the item has usable backing media; otherwise <c>false</c>.</returns>
+    internal static bool MediaFileExists(BaseItem item)
+    {
+        if (string.IsNullOrEmpty(item.Path))
+        {
+            return false;
+        }
+
+        if (!item.IsFileProtocol)
+        {
+            return true;
+        }
+
+        // Path may point at a file or, for folder-based media, a directory.
+        return System.IO.File.Exists(item.Path) || Directory.Exists(item.Path);
+    }
 }

Jellyfin.Plugin.JRay/Controllers/TruthController.cs

@@ -12,11 +12,18 @@ namespace Jellyfin.Plugin.JRay.Controllers;
 /// <summary>
 /// Accepts scene-actor-extraction "truth" data pushed directly by a remote
 /// extraction worker, for servers that cannot run the extraction pipeline
-/// locally. See SPEC.md.
+/// locally. See SPEC.md §2.
 /// </summary>
+/// <remarks>
+/// The <c>schema_version</c> check here refuses an unrecognised version rather
+/// than guessing at its shape. It is currently the only source that checks —
+/// sidecar reads do not — which JR-003 requires be fixed by moving the check
+/// into the shared read path.
+/// </remarks>
 [ApiController]
 [Route("Plugins/JRay/Items/{itemId}/Truth")]
 [Authorize(Roles = "Administrator")]
+// TRACES: JR-003, JR-009, JR-014 | SR-003
 public class TruthController : ControllerBase
 {
     private const int SupportedSchemaVersion = 1;
@@ -52,7 +59,8 @@ public class TruthController : ControllerBase
             return BadRequest($"Unsupported schema_version {truth.SchemaVersion}; expected {SupportedSchemaVersion}.");
         }
 
-        await _managedTruthStore.SaveAsync(itemId, truth, cancellationToken).ConfigureAwait(false);
+        var provenance = TruthProvenance.Local(TruthSource.Pushed, DateTime.UtcNow);
+        await _managedTruthStore.SaveAsync(itemId, truth, provenance, cancellationToken).ConfigureAwait(false);
         _truthDataService.Invalidate(itemId);
 
         return NoContent();

Jellyfin.Plugin.JRay/Controllers/WebController.cs

@@ -11,9 +11,14 @@ namespace Jellyfin.Plugin.JRay.Controllers;
 /// Serves static client-side assets for JRay, e.g. the pause-overlay script
 /// injected into the web client.
 /// </summary>
+/// <remarks>
+/// Anonymous by necessity, not by oversight: the script tag is injected into
+/// <c>index.html</c>, which is served before a user has logged in.
+/// </remarks>
 [ApiController]
 [Route("Plugins/JRay")]
 [AllowAnonymous]
+// TRACES: JR-014, JR-020 | PR-001
 public class WebController : ControllerBase
 {
     private const string OverlayScriptResource = "Jellyfin.Plugin.JRay.Web.jray-overlay.js";

Jellyfin.Plugin.JRay/Jellyfin.Plugin.JRay.csproj

@@ -25,6 +25,15 @@
     <PackageReference Include="SmartAnalyzers.MultithreadingAnalyzer" Version="1.1.31" PrivateAssets="All" />
   </ItemGroup>
 
+  <ItemGroup>
+    <!-- Lets the test project reach internals such as
+         WebClientPatchService.RemoveInjection, which is factored out precisely
+         so the removal logic is testable without touching a filesystem. -->
+    <AssemblyAttribute Include="System.Runtime.CompilerServices.InternalsVisibleToAttribute">
+      <_Parameter1>Jellyfin.Plugin.JRay.Tests</_Parameter1>
+    </AssemblyAttribute>
+  </ItemGroup>
+
   <ItemGroup>
     <None Remove="Configuration\configPage.html" />
     <EmbeddedResource Include="Configuration\configPage.html" />

Jellyfin.Plugin.JRay/Models/ActorInScene.cs

@@ -3,9 +3,17 @@ using System.Text.Json.Serialization;
 namespace Jellyfin.Plugin.JRay.Models;
 
 /// <summary>
-/// An actor visible on screen at a queried timestamp.
+/// An actor present in the scene at a queried timestamp.
 /// </summary>
-public class ActorAtTime
+/// <remarks>
+/// "Present in the scene", not "visible on screen". The truth file makes a claim
+/// about scene membership, so an actor who has turned away or is off-camera
+/// during a reverse shot is still present. The type was named
+/// <c>ActorAtTime</c>, which invited exactly the instantaneous reading SR-002
+/// forbids.
+/// </remarks>
+// TRACES: JR-005 | SR-002
+public class ActorInScene
 {
     /// <summary>
     /// Gets or sets the actor's display name.

Jellyfin.Plugin.JRay/Models/DependencyStatus.cs

@@ -0,0 +1,37 @@
+using System.Text.Json.Serialization;
+
+namespace Jellyfin.Plugin.JRay.Models;
+
+/// <summary>
+/// Whether JRay's one hard dependency is satisfied, and what to do if it is not.
+/// </summary>
+/// <remarks>
+/// Jellyfin has no plugin dependency mechanism — a manifest cannot declare that
+/// another plugin is required, and nothing will install one. The gap is closed by
+/// telling the admin, on the page where they can act on it. A warning that exists
+/// only in the server log is one nobody reads.
+/// </remarks>
+public class DependencyStatus
+{
+    /// <summary>
+    /// Gets or sets a value indicating whether the File Transformation plugin was
+    /// found and JRay's overlay transformation registered with it.
+    /// </summary>
+    [JsonPropertyName("file_transformation_available")]
+    public bool FileTransformationAvailable { get; set; }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether the overlay is switched on in
+    /// configuration. It is served only when this <i>and</i>
+    /// <see cref="FileTransformationAvailable"/> hold.
+    /// </summary>
+    [JsonPropertyName("overlay_enabled")]
+    public bool OverlayEnabled { get; set; }
+
+    /// <summary>
+    /// Gets or sets the repository manifest URL an admin adds to install the
+    /// missing dependency.
+    /// </summary>
+    [JsonPropertyName("file_transformation_manifest_url")]
+    public string FileTransformationManifestUrl { get; set; } = string.Empty;
+}

Jellyfin.Plugin.JRay/Models/JRayContext.cs

@@ -11,8 +11,8 @@ namespace Jellyfin.Plugin.JRay.Models;
 public class JRayContext
 {
     /// <summary>
-    /// Gets the list of actors visible on screen at the queried timestamp.
+    /// Gets the list of actors visible in the scene at the queried timestamp.
     /// </summary>
     [JsonPropertyName("actors")]
-    public Collection<ActorAtTime> Actors { get; } = new();
+    public Collection<ActorInScene> Actors { get; } = new();
 }

Jellyfin.Plugin.JRay/Models/Jmanifest.cs

@@ -0,0 +1,44 @@
+using System.Collections.ObjectModel;
+using System.Text.Json.Serialization;
+
+namespace Jellyfin.Plugin.JRay.Models;
+
+/// <summary>
+/// One shareable actor timeline for one cut of one title, as the public server
+/// serves it. See the server specification §2.
+/// </summary>
+/// <remarks>
+/// This is the <b>exchange envelope</b>, versioned by <c>jmanifest_version</c>
+/// and deliberately separate from the truth file's <c>schema_version</c>: a
+/// change to how manifests are transported need not force a truth-file bump.
+/// They currently coincide at 2 only because the SR-003 bump touched both.
+/// <para>
+/// A manifest is never trusted merely because a server served it (JR-027). Every
+/// field below is re-validated on receipt against the same rules the server
+/// applies on upload.
+/// </para>
+/// </remarks>
+// TRACES: JR-025, JR-027 | SR-003
+public class Jmanifest
+{
+    /// <summary>Gets or sets the exchange envelope version this manifest speaks.</summary>
+    [JsonPropertyName("jmanifest_version")]
+    public int JmanifestVersion { get; set; }
+
+    /// <summary>Gets or sets what the work is — TMDB/IMDB ids and episode coordinates.</summary>
+    [JsonPropertyName("identity")]
+    public JmanifestIdentity? Identity { get; set; }
+
+    /// <summary>Gets or sets which encode the timings apply to.</summary>
+    [JsonPropertyName("cut")]
+    public JmanifestCut? Cut { get; set; }
+
+    /// <summary>Gets or sets extraction provenance.</summary>
+    [JsonPropertyName("extraction")]
+    public JmanifestExtraction? Extraction { get; set; }
+
+    /// <summary>Gets the actors and their presence windows.</summary>
+    [JsonPropertyName("actors")]
+    [JsonObjectCreationHandling(JsonObjectCreationHandling.Populate)]
+    public Collection<JmanifestActor> Actors { get; } = new();
+}

Jellyfin.Plugin.JRay/Models/JmanifestActor.cs

@@ -0,0 +1,29 @@
+using System.Collections.ObjectModel;
+using System.Text.Json.Serialization;
+
+namespace Jellyfin.Plugin.JRay.Models;
+
+/// <summary>One actor's timeline within a manifest.</summary>
+public class JmanifestActor
+{
+    /// <summary>
+    /// Gets or sets the display name. Server-authoritative on download: the
+    /// server resolves each actor to a TMDB person and serves names from its own
+    /// table, so a name a contributor invented never round-trips.
+    /// </summary>
+    [JsonPropertyName("name")]
+    public string? Name { get; set; }
+
+    /// <summary>Gets or sets the IMDB person id.</summary>
+    [JsonPropertyName("imdb_id")]
+    public string? ImdbId { get; set; }
+
+    /// <summary>Gets or sets the TMDB person id — the primary join key.</summary>
+    [JsonPropertyName("tmdb_id")]
+    public string? TmdbId { get; set; }
+
+    /// <summary>Gets the presence windows.</summary>
+    [JsonPropertyName("scenes")]
+    [JsonObjectCreationHandling(JsonObjectCreationHandling.Populate)]
+    public Collection<JmanifestScene> Scenes { get; } = new();
+}

Jellyfin.Plugin.JRay/Models/JmanifestCut.cs

@@ -0,0 +1,32 @@
+using System.Collections.ObjectModel;
+using System.Text.Json.Serialization;
+
+namespace Jellyfin.Plugin.JRay.Models;
+
+/// <summary>Cut fingerprint (server spec §2, §3).</summary>
+public class JmanifestCut
+{
+    /// <summary>Gets or sets the decoded duration the timings came from.</summary>
+    [JsonPropertyName("runtime_sec")]
+    public double RuntimeSec { get; set; }
+
+    /// <summary>Gets or sets the container duration, if it differs.</summary>
+    [JsonPropertyName("container_duration_sec")]
+    public double? ContainerDurationSec { get; set; }
+
+    /// <summary>
+    /// Gets or sets the OpenSubtitles file hash, as a server may report it.
+    /// </summary>
+    /// <remarks>
+    /// Read-only in practice: the plugin never <em>sends</em> one. The file-hash
+    /// match tier is withdrawn on legal grounds — see
+    /// <see cref="Configuration.MatchTier"/> — because a file hash identifies the
+    /// exact release a user holds rather than the cut the timings describe.
+    /// </remarks>
+    [JsonPropertyName("video_hash")]
+    public string? VideoHash { get; set; }
+
+    /// <summary>Gets or sets the version-prefixed spectral-peak signature.</summary>
+    [JsonPropertyName("audio_signature")]
+    public string? AudioSignature { get; set; }
+}

Jellyfin.Plugin.JRay/Models/JmanifestExtraction.cs

@@ -0,0 +1,31 @@
+using System.Collections.ObjectModel;
+using System.Text.Json.Serialization;
+
+namespace Jellyfin.Plugin.JRay.Models;
+
+/// <summary>Extraction provenance (server spec §2).</summary>
+public class JmanifestExtraction
+{
+    /// <summary>Gets or sets the sampling rate used during extraction.</summary>
+    [JsonPropertyName("sample_fps")]
+    public double? SampleFps { get; set; }
+
+    /// <summary>
+    /// Gets or sets the re-acquisition timeout that shapes window extent.
+    /// Successor to the withdrawn <c>anneal_sec</c>.
+    /// </summary>
+    [JsonPropertyName("extinction_sec")]
+    public double? ExtinctionSec { get; set; }
+
+    /// <summary>Gets or sets the producing pipeline's version string.</summary>
+    [JsonPropertyName("pipeline_version")]
+    public string? PipelineVersion { get; set; }
+
+    /// <summary>Gets or sets how many references the gallery held.</summary>
+    [JsonPropertyName("gallery_size")]
+    public int? GallerySize { get; set; }
+
+    /// <summary>Gets or sets <c>global</c> or <c>limited</c>.</summary>
+    [JsonPropertyName("gallery_scope")]
+    public string? GalleryScope { get; set; }
+}

Jellyfin.Plugin.JRay/Models/JmanifestIdentity.cs

@@ -0,0 +1,44 @@
+using System.Collections.ObjectModel;
+using System.Text.Json.Serialization;
+
+namespace Jellyfin.Plugin.JRay.Models;
+
+/// <summary>Title identity (server spec §2).</summary>
+public class JmanifestIdentity
+{
+    /// <summary>Gets or sets <c>movie</c> or <c>episode</c>.</summary>
+    [JsonPropertyName("type")]
+    public string Type { get; set; } = string.Empty;
+
+    /// <summary>Gets or sets the TMDB id, for a movie.</summary>
+    [JsonPropertyName("tmdb_id")]
+    public string? TmdbId { get; set; }
+
+    /// <summary>Gets or sets the IMDB id, for a movie.</summary>
+    [JsonPropertyName("imdb_id")]
+    public string? ImdbId { get; set; }
+
+    /// <summary>Gets or sets the series TMDB id, for an episode.</summary>
+    [JsonPropertyName("series_tmdb_id")]
+    public string? SeriesTmdbId { get; set; }
+
+    /// <summary>Gets or sets the series IMDB id, for an episode.</summary>
+    [JsonPropertyName("series_imdb_id")]
+    public string? SeriesImdbId { get; set; }
+
+    /// <summary>Gets or sets the season number, for an episode.</summary>
+    [JsonPropertyName("season")]
+    public int? Season { get; set; }
+
+    /// <summary>Gets or sets the episode number, for an episode.</summary>
+    [JsonPropertyName("episode")]
+    public int? Episode { get; set; }
+
+    /// <summary>Gets or sets the display title.</summary>
+    [JsonPropertyName("title")]
+    public string? Title { get; set; }
+
+    /// <summary>Gets or sets the release year.</summary>
+    [JsonPropertyName("year")]
+    public int? Year { get; set; }
+}

Jellyfin.Plugin.JRay/Models/JmanifestScene.cs

@@ -0,0 +1,38 @@
+using System.Collections.ObjectModel;
+using System.Text.Json.Serialization;
+
+namespace Jellyfin.Plugin.JRay.Models;
+
+/// <summary>
+/// One presence window.
+/// </summary>
+/// <remarks>
+/// <b>A window is a claim about scene membership, not a recognition event</b>
+/// (SR-002). An actor who turns away, is occluded, or is off-camera while the
+/// shot cuts to whoever they are speaking to is still present — so a consumer
+/// must never read a window boundary as "the face was detected here", and must
+/// not merge, split or trim windows.
+/// </remarks>
+public class JmanifestScene
+{
+    /// <summary>Gets or sets the window start, in seconds.</summary>
+    [JsonPropertyName("start")]
+    public double Start { get; set; }
+
+    /// <summary>Gets or sets the window end, in seconds, inclusive.</summary>
+    [JsonPropertyName("end")]
+    public double End { get; set; }
+
+    /// <summary>
+    /// Gets or sets the accumulated posterior that justified this claim, in [0, 1].
+    /// </summary>
+    [JsonPropertyName("belief")]
+    public double? Belief { get; set; }
+
+    /// <summary>
+    /// Gets or sets how the actor was identified: <c>live</c>, <c>deferred</c>
+    /// or <c>pooled</c>.
+    /// </summary>
+    [JsonPropertyName("route")]
+    public string? Route { get; set; }
+}

Jellyfin.Plugin.JRay/Models/ManifestFetchResponse.cs

@@ -0,0 +1,31 @@
+using System.Collections.ObjectModel;
+using System.Text.Json.Serialization;
+
+namespace Jellyfin.Plugin.JRay.Models;
+
+/// <summary>The server's reply to a manifest fetch (server spec §4).</summary>
+public class ManifestFetchResponse
+{
+    /// <summary>
+    /// Gets or sets the cut-match tier that was achieved: <c>exact</c>,
+    /// <c>audio</c>, <c>runtime</c> or <c>loose</c>.
+    /// </summary>
+    [JsonPropertyName("match")]
+    public string Match { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the offset, in seconds, the client must add to every window.
+    /// </summary>
+    /// <remarks>
+    /// Non-zero only for an <c>audio</c>-tier match, where the same cut was
+    /// found at a different trim. <b>The server returns the offset; the client
+    /// applies it</b> — manifests are never rewritten, so one stored manifest
+    /// serves every trim of the same cut.
+    /// </remarks>
+    [JsonPropertyName("offset_sec")]
+    public double OffsetSec { get; set; }
+
+    /// <summary>Gets or sets the manifest itself.</summary>
+    [JsonPropertyName("manifest")]
+    public Jmanifest? Manifest { get; set; }
+}

Jellyfin.Plugin.JRay/Models/ManifestFetchResult.cs

@@ -0,0 +1,30 @@
+namespace Jellyfin.Plugin.JRay.Models;
+
+/// <summary>
+/// What a fetch stored, and from where.
+/// </summary>
+public class ManifestFetchResult
+{
+    /// <summary>Gets or sets the server that supplied the manifest.</summary>
+    public string ServerUrl { get; set; } = string.Empty;
+
+    /// <summary>Gets or sets the cut-match tier achieved.</summary>
+    public string Match { get; set; } = string.Empty;
+
+    /// <summary>Gets or sets the offset applied to every window, in seconds.</summary>
+    public double OffsetSec { get; set; }
+
+    /// <summary>Gets or sets how many actors the stored truth file holds.</summary>
+    public int ActorCount { get; set; }
+
+    /// <summary>
+    /// Gets or sets a caveat to surface in the UI, or null when the match needs
+    /// no explanation.
+    /// </summary>
+    /// <remarks>
+    /// A <c>loose</c> match must surface as a caveat rather than being applied
+    /// silently — the runtimes differ by up to 30 seconds, which is usually a
+    /// different trim of the same cut but is not guaranteed to be.
+    /// </remarks>
+    public string? Caveat { get; set; }
+}

Jellyfin.Plugin.JRay/Models/SeriesBundle.cs

@@ -0,0 +1,17 @@
+using System.Collections.ObjectModel;
+using System.Text.Json.Serialization;
+
+namespace Jellyfin.Plugin.JRay.Models;
+
+/// <summary>A series bundle (server spec §2).</summary>
+public class SeriesBundle
+{
+    /// <summary>Gets or sets the envelope version.</summary>
+    [JsonPropertyName("jmanifest_version")]
+    public int JmanifestVersion { get; set; }
+
+    /// <summary>Gets the episode manifests the server holds.</summary>
+    [JsonPropertyName("episodes")]
+    [JsonObjectCreationHandling(JsonObjectCreationHandling.Populate)]
+    public Collection<Jmanifest> Episodes { get; } = new();
+}

Jellyfin.Plugin.JRay/Models/ServerCapabilities.cs

@@ -0,0 +1,23 @@
+using System.Collections.ObjectModel;
+using System.Text.Json.Serialization;
+
+namespace Jellyfin.Plugin.JRay.Models;
+
+/// <summary>What a server says it supports (server spec §9a).</summary>
+public class ServerCapabilities
+{
+    /// <summary>Gets or sets the server's own identity.</summary>
+    [JsonPropertyName("server_id")]
+    public string? ServerId { get; set; }
+
+    /// <summary>
+    /// Gets the exchange envelope versions the server accepts.
+    /// </summary>
+    /// <remarks>
+    /// Checked once rather than discovered as a rejection per manifest across a
+    /// whole library sweep.
+    /// </remarks>
+    [JsonPropertyName("jmanifest_versions")]
+    [JsonObjectCreationHandling(JsonObjectCreationHandling.Populate)]
+    public Collection<int> JmanifestVersions { get; } = new();
+}

Jellyfin.Plugin.JRay/Models/TransformationPayload.cs

@@ -0,0 +1,22 @@
+namespace Jellyfin.Plugin.JRay.Models;
+
+/// <summary>
+/// The object handed to JRay's transformation callback by the File
+/// Transformation plugin.
+/// </summary>
+/// <remarks>
+/// That plugin builds a Newtonsoft <c>JObject</c> with a single <c>contents</c>
+/// key and calls <c>JObject.ToObject(parameterType)</c> against this type.
+/// Newtonsoft binds member names case-insensitively, so <see cref="Contents"/>
+/// binds to <c>contents</c> without an attribute — and a System.Text.Json
+/// attribute would have no effect here.
+/// </remarks>
+public class TransformationPayload
+{
+    /// <summary>
+    /// Gets or sets the current contents of the file being served, including
+    /// any transformations applied by other plugins ahead of JRay in the
+    /// chain.
+    /// </summary>
+    public string? Contents { get; set; }
+}

Jellyfin.Plugin.JRay/Models/TruthActor.cs

@@ -5,8 +5,19 @@ namespace Jellyfin.Plugin.JRay.Models;
 
 /// <summary>
 /// One actor entry in a <see cref="TruthFile"/>, with the time windows during
-/// which they are visible on screen.
+/// which they are present in the scene.
 /// </summary>
+/// <remarks>
+/// "Present in the scene", not "visible on screen": a window is a claim about
+/// scene membership, so an actor who turns away or is off-camera during a
+/// reverse shot is still present. Two windows mean a genuine departure and
+/// return, not a break in detection.
+///
+/// Identity is public identifiers — never a name alone, which is ambiguous and
+/// unstable. <c>jellyfin_id</c> is preferred locally and stripped on
+/// contribution, being meaningless outside the instance that produced it.
+/// </remarks>
+// TRACES: JR-004, JR-007 | SR-001, SR-002
 public class TruthActor
 {
     /// <summary>
@@ -34,7 +45,7 @@ public class TruthActor
     public string JellyfinId { get; set; } = string.Empty;
 
     /// <summary>
-    /// Gets the list of [start_sec, end_sec] windows during which the actor is on screen.
+    /// Gets the list of [start_sec, end_sec] windows during which the actor is in the scene.
     /// </summary>
     [JsonPropertyName("scenes")]
     [JsonObjectCreationHandling(JsonObjectCreationHandling.Populate)]

Jellyfin.Plugin.JRay/Models/TruthFile.cs

@@ -5,8 +5,19 @@ namespace Jellyfin.Plugin.JRay.Models;
 
 /// <summary>
 /// Root object of a scene-actor-extraction "truth" file
-/// (schema_version 1, minimal verbosity). See SPEC.md.
+/// (schema_version 1, minimal verbosity). See SPEC.md §1.
 /// </summary>
+/// <remarks>
+/// JRay <b>owns</b> this format; the extraction pipeline is its producer and the
+/// public server carries a derived envelope. Because three repos ship
+/// independently, breaking changes are batched into one coordinated
+/// <c>schema_version</c> bump rather than made piecemeal.
+///
+/// This type is still the v1 shape. JR-002 replaces it: <c>anneal_sec</c> out,
+/// an <c>extraction</c> provenance block and a <c>cut</c> block in, and
+/// <c>scenes</c> becoming objects that carry belief and identification route.
+/// </remarks>
+// TRACES: JR-001, JR-002 | SR-003
 public class TruthFile
 {
     /// <summary>
@@ -34,7 +45,7 @@ public class TruthFile
     public double AnnealSec { get; set; }
 
     /// <summary>
-    /// Gets the list of actors detected in the film, each with their on-screen scene windows.
+    /// Gets the list of actors in the film, each with their scene-presence windows.
     /// </summary>
     [JsonPropertyName("actors")]
     [JsonObjectCreationHandling(JsonObjectCreationHandling.Populate)]

Jellyfin.Plugin.JRay/Models/TruthProvenance.cs

@@ -0,0 +1,98 @@
+using System;
+using System.Text.Json.Serialization;
+using Jellyfin.Plugin.JRay.Configuration;
+
+namespace Jellyfin.Plugin.JRay.Models;
+
+/// <summary>
+/// Where an item's truth data came from.
+/// </summary>
+public enum TruthSource
+{
+    /// <summary>A <c>.jray.json</c> file beside the media, written locally.</summary>
+    Sidecar = 0,
+
+    /// <summary>Pushed over HTTP by a worker that cannot write beside the media.</summary>
+    Pushed = 1,
+
+    /// <summary>Fetched from a manifest server and converted to a truth file.</summary>
+    Fetched = 2,
+}
+
+/// <summary>
+/// How an item's truth data was obtained, recorded alongside it.
+/// </summary>
+/// <remarks>
+/// The three sources are not interchangeable. A locally computed sidecar and a
+/// <c>loose</c>-tier manifest from a third-party server make claims of very
+/// different strength about the same item, and once stored they are otherwise
+/// indistinguishable — the truth file itself records nothing about how it
+/// arrived.
+///
+/// <para>
+/// This is stored <b>beside</b> the truth file rather than inside it. Injecting
+/// fields would mean the bytes served back are not the bytes the producer wrote,
+/// which is the property JR-004 turns on.
+/// </para>
+/// </remarks>
+// TRACES: JR-010, JR-036 | PR-001
+public class TruthProvenance
+{
+    /// <summary>
+    /// Gets or sets which of the three routes delivered this truth data.
+    /// </summary>
+    [JsonPropertyName("source")]
+    public TruthSource Source { get; set; }
+
+    /// <summary>
+    /// Gets or sets the server a fetched manifest came from. Empty for the
+    /// local sources, whose origin is this instance.
+    /// </summary>
+    [JsonPropertyName("server_url")]
+    public string ServerUrl { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the cut-match tier a fetched manifest reached.
+    /// </summary>
+    /// <remarks>
+    /// Null for local sources: a sidecar or a push is about *this* file, so
+    /// there is no cut to match. The tier is what makes a fetched claim
+    /// interpretable — <c>loose</c> means "probably the same cut", which the UI
+    /// must surface rather than apply silently (JR-036).
+    /// </remarks>
+    [JsonPropertyName("match_tier")]
+    public MatchTier? MatchTier { get; set; }
+
+    /// <summary>
+    /// Gets or sets the offset, in seconds, applied to every window before
+    /// storage so the stored timings are in this file's own timebase (JR-030).
+    /// </summary>
+    /// <remarks>
+    /// Recorded because it is otherwise unrecoverable: once applied, the stored
+    /// windows look native, and nothing would say they had been shifted.
+    /// </remarks>
+    [JsonPropertyName("offset_sec")]
+    public double OffsetSec { get; set; }
+
+    /// <summary>
+    /// Gets or sets a human-readable caveat to surface with the overlay, or
+    /// null when the claim needs none.
+    /// </summary>
+    [JsonPropertyName("caveat")]
+    public string? Caveat { get; set; }
+
+    /// <summary>
+    /// Gets or sets when this truth data was recorded, UTC.
+    /// </summary>
+    [JsonPropertyName("recorded_at")]
+    public DateTime RecordedAt { get; set; }
+
+    /// <summary>
+    /// Creates provenance for truth data produced on this instance.
+    /// </summary>
+    /// <param name="source">Either <see cref="TruthSource.Sidecar"/> or <see cref="TruthSource.Pushed"/>.</param>
+    /// <param name="recordedAt">When it was recorded, UTC.</param>
+    /// <returns>The provenance record.</returns>
+    public static TruthProvenance Local(TruthSource source, DateTime recordedAt)
+        => new() { Source = source, RecordedAt = recordedAt };
+}

Jellyfin.Plugin.JRay/Plugin.cs

@@ -17,6 +17,7 @@ namespace Jellyfin.Plugin.JRay;
 public class Plugin : BasePlugin<PluginConfiguration>, IHasWebPages
 {
     private readonly ILogger<Plugin> _logger;
+    private readonly bool _usingFileTransformation;
 
     /// <summary>
     /// Initializes a new instance of the <see cref="Plugin"/> class.
@@ -30,8 +31,25 @@ public class Plugin : BasePlugin<PluginConfiguration>, IHasWebPages
         Instance = this;
         _logger = logger;
 
-        WebClientPatchService.Apply(ApplicationPaths, Configuration.EnableOverlay, _logger);
-        ConfigurationChanged += (_, _) => WebClientPatchService.Apply(ApplicationPaths, Configuration.EnableOverlay, _logger);
+        // The File Transformation plugin rewrites index.html as it is served.
+        // Registration is unconditional: the transformation itself checks
+        // EnableOverlay at request time, so toggling the setting takes effect
+        // without re-registering.
+        _usingFileTransformation = FileTransformationRegistration.TryRegister(_logger);
+
+        if (!_usingFileTransformation)
+        {
+            _logger.LogWarning(
+                "JRay: the pause overlay is disabled because the File Transformation plugin " +
+                "is not available. Install it from " +
+                "https://github.com/IAmParadox27/jellyfin-plugin-file-transformation. " +
+                "All other JRay features are unaffected.");
+        }
+
+        // JRay never injects into index.html. This only ever *removes* a patch
+        // left by an earlier version of JRay, identified by its own marker —
+        // see SPEC.md JR-021/JR-022.
+        WebClientPatchService.RemoveLegacyPatch(ApplicationPaths, _logger);
     }
 
     /// <inheritdoc />
@@ -45,6 +63,20 @@ public class Plugin : BasePlugin<PluginConfiguration>, IHasWebPages
     /// </summary>
     public static Plugin? Instance { get; private set; }
 
+    /// <summary>
+    /// Gets a value indicating whether the pause overlay should currently be
+    /// served. Read by the File Transformation callback at request time, so
+    /// toggling the setting takes effect without re-registering.
+    /// </summary>
+    internal static bool OverlayEnabled => Instance?.Configuration.EnableOverlay ?? false;
+
+    /// <summary>
+    /// Gets a value indicating whether the File Transformation plugin was found
+    /// at startup. When it was not, the overlay is disabled and every other JRay
+    /// feature continues to work.
+    /// </summary>
+    internal static bool FileTransformationAvailable => Instance?._usingFileTransformation ?? false;
+
     /// <inheritdoc />
     public IEnumerable<PluginPageInfo> GetPages()
     {

Jellyfin.Plugin.JRay/ServiceRegistrator.cs

@@ -17,5 +17,10 @@ public class ServiceRegistrator : IPluginServiceRegistrator
         serviceCollection.AddSingleton<IManagedTruthStore, ManagedTruthStore>();
         serviceCollection.AddSingleton<ITruthDataService, TruthDataService>();
         serviceCollection.AddSingleton<IMediaPolicyStore, MediaPolicyStore>();
+
+        // Singleton so per-server backoff state survives across requests: a
+        // server that is down should be skipped for the whole sweep, not
+        // retried once per item (JR-037).
+        serviceCollection.AddSingleton<IManifestExchangeClient, ManifestExchangeClient>();
     }
 }

Jellyfin.Plugin.JRay/Services/FileTransformationRegistration.cs

@@ -0,0 +1,175 @@
+using System;
+using System.Globalization;
+using System.Linq;
+using System.Reflection;
+using System.Runtime.Loader;
+using System.Text.Json;
+using Jellyfin.Plugin.JRay.Models;
+using Microsoft.Extensions.Logging;
+
+namespace Jellyfin.Plugin.JRay.Services;
+
+/// <summary>
+/// Registers JRay's overlay script with the
+/// <see href="https://github.com/IAmParadox27/jellyfin-plugin-file-transformation">File Transformation</see>
+/// plugin, which rewrites <c>index.html</c> as it is served instead of
+/// modifying the file on disk. This is non-destructive and composes with
+/// other plugins that patch the same file.
+/// </summary>
+/// <remarks>
+/// File Transformation is referenced by reflection (rather than a NuGet
+/// package reference) so JRay still loads when it isn't installed. JRay must
+/// never bundle the assembly: a bundled copy would sit in a different
+/// <c>AssemblyLoadContext</c> from the real one, which is precisely the failure
+/// the reflection integration exists to avoid.
+///
+/// This is the only route by which JRay reaches the web client. There is no
+/// on-disk fallback (JR-021), so when registration fails the overlay is simply
+/// disabled — which is why both failure paths log a warning naming the missing
+/// plugin rather than quietly degrading.
+/// </remarks>
+// TRACES: JR-020, JR-023 | PR-004
+public static class FileTransformationRegistration
+{
+    /// <summary>
+    /// The marker comment written alongside the injected script tag, used to
+    /// keep the transformation idempotent.
+    /// </summary>
+    internal const string Marker = "<!-- jray-overlay -->";
+
+    /// <summary>
+    /// Repository manifest an admin adds to install the dependency. Surfaced on
+    /// the configuration page rather than only in the log, since that is where
+    /// it can be acted on.
+    /// </summary>
+    public const string ManifestUrl = "https://www.iamparadox.dev/jellyfin/plugins/manifest.json";
+
+    private const string PluginInterfaceTypeName = "Jellyfin.Plugin.FileTransformation.PluginInterface";
+    private const string RegisterMethodName = "RegisterTransformation";
+    private const string ScriptTag = "<script defer src=\"/Plugins/JRay/ClientScript\"></script>";
+    private const string BodyClose = "</body>";
+
+    /// <summary>
+    /// Stable id for JRay's index.html transformation. File Transformation
+    /// keys registrations on this, so re-registering replaces rather than
+    /// duplicates.
+    /// </summary>
+    private static readonly Guid TransformationId = Guid.Parse("2c9b5a41-6ad0-4c1e-9f7d-1d1e6b0d5a90");
+
+    /// <summary>
+    /// Attempts to register JRay's index.html transformation with the File
+    /// Transformation plugin.
+    /// </summary>
+    /// <param name="logger">The logger.</param>
+    /// <returns><see langword="true"/> if the transformation was registered;
+    /// <see langword="false"/> if the File Transformation plugin is not
+    /// installed or its interface could not be invoked.</returns>
+    public static bool TryRegister(ILogger logger)
+    {
+        ArgumentNullException.ThrowIfNull(logger);
+
+        try
+        {
+            var registerMethod = ResolveRegisterMethod();
+            if (registerMethod is null)
+            {
+                logger.LogWarning(
+                    "JRay: the File Transformation plugin was not found, so the pause overlay is "
+                    + "disabled. JRay does not modify index.html on disk and has no fallback. "
+                    + "Install it from {ManifestUrl} to enable the overlay; every other JRay "
+                    + "feature is unaffected.",
+                    ManifestUrl);
+                return false;
+            }
+
+            var payload = BuildPayload(registerMethod);
+            registerMethod.Invoke(null, [payload]);
+
+            logger.LogInformation("JRay: registered index.html transformation with the File Transformation plugin.");
+            return true;
+        }
+        catch (Exception ex) when (ex is TargetInvocationException or InvalidOperationException or JsonException or MissingMethodException)
+        {
+            logger.LogWarning(
+                ex,
+                "JRay: the File Transformation plugin is present but registration failed, so the "
+                + "pause overlay is disabled. JRay does not modify index.html on disk and has no "
+                + "fallback. Every other JRay feature is unaffected.");
+            return false;
+        }
+    }
+
+    /// <summary>
+    /// The transformation callback invoked by the File Transformation plugin.
+    /// It is resolved by name via reflection, so the signature (public,
+    /// static, single payload parameter, returns <see cref="string"/>) must
+    /// not change.
+    /// </summary>
+    /// <param name="payload">The current state of the file being served.</param>
+    /// <returns>The transformed file contents.</returns>
+    public static string TransformIndexHtml(TransformationPayload payload)
+    {
+        ArgumentNullException.ThrowIfNull(payload);
+
+        var contents = payload.Contents ?? string.Empty;
+        if (!Plugin.OverlayEnabled || contents.Contains(Marker, StringComparison.Ordinal))
+        {
+            return contents;
+        }
+
+        var index = contents.LastIndexOf(BodyClose, StringComparison.OrdinalIgnoreCase);
+        if (index < 0)
+        {
+            return contents;
+        }
+
+        return contents[..index]
+            + ScriptTag
+            + Marker
+            + "\n"
+            + contents[index..];
+    }
+
+    private static MethodInfo? ResolveRegisterMethod()
+    {
+        var assembly = AssemblyLoadContext.All
+            .SelectMany(context => context.Assemblies)
+            .FirstOrDefault(candidate => candidate.FullName?.Contains(".FileTransformation", StringComparison.Ordinal) ?? false);
+
+        return assembly?
+            .GetType(PluginInterfaceTypeName)?
+            .GetMethod(RegisterMethodName, BindingFlags.Public | BindingFlags.Static);
+    }
+
+    /// <summary>
+    /// Builds the registration payload. File Transformation expects a
+    /// Newtonsoft <c>JObject</c>, which JRay does not reference, so the
+    /// payload is serialized to JSON and parsed back through the type the
+    /// target method actually declares.
+    /// </summary>
+    private static object BuildPayload(MethodInfo registerMethod)
+    {
+        // File Transformation matches this against Assembly.FullName exactly,
+        // so it must be the full display name, not the short name.
+        var assemblyName = typeof(FileTransformationRegistration).Assembly.FullName
+            ?? throw new InvalidOperationException("JRay assembly has no name.");
+
+        var json = JsonSerializer.Serialize(new
+        {
+            id = TransformationId.ToString("D", CultureInfo.InvariantCulture),
+            fileNamePattern = "index.html",
+            callbackAssembly = assemblyName,
+            callbackClass = typeof(FileTransformationRegistration).FullName,
+            callbackMethod = nameof(TransformIndexHtml)
+        });
+
+        var payloadType = registerMethod.GetParameters().FirstOrDefault()?.ParameterType
+            ?? throw new InvalidOperationException("RegisterTransformation has no parameters.");
+
+        var parseMethod = payloadType.GetMethod("Parse", BindingFlags.Public | BindingFlags.Static, [typeof(string)])
+            ?? throw new InvalidOperationException($"Cannot construct File Transformation payload of type '{payloadType.FullName}'.");
+
+        return parseMethod.Invoke(null, [json])
+            ?? throw new InvalidOperationException("File Transformation payload parsed to null.");
+    }
+}

Jellyfin.Plugin.JRay/Services/Interfaces/IManagedTruthStore.cs

@@ -25,9 +25,21 @@ public interface IManagedTruthStore
     /// </summary>
     /// <param name="itemId">The Jellyfin library item id.</param>
     /// <param name="truth">The truth file contents to persist.</param>
+    /// <param name="provenance">How this truth data was obtained.</param>
     /// <param name="cancellationToken">Cancellation token.</param>
     /// <returns>A task that completes when the file has been written.</returns>
-    Task SaveAsync(Guid itemId, TruthFile truth, CancellationToken cancellationToken);
+    /// <remarks>
+    /// Provenance is written beside the truth file, never into it: the bytes
+    /// served back must be the bytes the producer wrote (JR-004).
+    /// </remarks>
+    Task SaveAsync(Guid itemId, TruthFile truth, TruthProvenance provenance, CancellationToken cancellationToken);
+
+    /// <summary>
+    /// Loads the provenance recorded alongside an item's managed truth data.
+    /// </summary>
+    /// <param name="itemId">The Jellyfin library item id.</param>
+    /// <returns>The provenance, or null if this item has no managed truth data.</returns>
+    TruthProvenance? LoadProvenance(Guid itemId);
 
     /// <summary>
     /// Deletes the managed truth file for the given item, if one exists.

Jellyfin.Plugin.JRay/Services/Interfaces/IManifestExchangeClient.cs

@@ -0,0 +1,53 @@
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using Jellyfin.Plugin.JRay.Configuration;
+
+namespace Jellyfin.Plugin.JRay.Services.Interfaces;
+
+/// <summary>
+/// Fetches actor-timeline manifests from the configured public servers.
+/// </summary>
+/// <remarks>
+/// Satisfies <c>JRay-public-server</c> UR-007: the plugin queries a configurable,
+/// <b>ordered</b> list of servers, and the first result clearing the configured
+/// match tier wins.
+/// </remarks>
+// TRACES: JR-025 | PR-006
+public interface IManifestExchangeClient
+{
+    /// <summary>
+    /// Fetches a movie manifest from the first server that has an acceptable one.
+    /// </summary>
+    /// <param name="servers">The configured servers, in trust order.</param>
+    /// <param name="minimumTier">The lowest cut-match tier that may be stored.</param>
+    /// <param name="query">Identity and cut parameters for the local item.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The accepted manifest, or null when no server had one.</returns>
+    Task<ManifestFetchOutcome?> FetchMovieAsync(
+        IReadOnlyList<ManifestServer> servers,
+        MatchTier minimumTier,
+        TitleQuery query,
+        CancellationToken cancellationToken);
+
+    /// <summary>
+    /// Fetches a single episode manifest.
+    /// </summary>
+    /// <param name="servers">The configured servers, in trust order.</param>
+    /// <param name="minimumTier">The lowest cut-match tier that may be stored.</param>
+    /// <param name="query">Identity and cut parameters for the local item.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The accepted manifest, or null when no server had one.</returns>
+    Task<ManifestFetchOutcome?> FetchEpisodeAsync(
+        IReadOnlyList<ManifestServer> servers,
+        MatchTier minimumTier,
+        TitleQuery query,
+        CancellationToken cancellationToken);
+
+    /// <summary>
+    /// Per-server reachability and last error, for the configuration page.
+    /// </summary>
+    /// <param name="servers">The configured servers.</param>
+    /// <returns>One status entry per configured server.</returns>
+    IReadOnlyList<ServerStatus> GetStatus(IReadOnlyList<ManifestServer> servers);
+}

Jellyfin.Plugin.JRay/Services/Interfaces/ITruthDataService.cs

@@ -18,6 +18,17 @@ public interface ITruthDataService
     /// <returns>The parsed truth file, or null if no truth file exists for this item.</returns>
     Task<TruthFile?> GetTruthAsync(Guid itemId, CancellationToken cancellationToken);
 
+    /// <summary>
+    /// Gets how the item's truth data was obtained, or null if it has none.
+    /// </summary>
+    /// <remarks>
+    /// Resolves the same precedence as <see cref="GetTruthAsync"/>: managed
+    /// truth (pushed or fetched) wins, and a sidecar is reported as such.
+    /// </remarks>
+    /// <param name="itemId">The Jellyfin library item id.</param>
+    /// <returns>The provenance of the truth data that would be served.</returns>
+    TruthProvenance? GetProvenance(Guid itemId);
+
     /// <summary>
     /// Removes any cached truth file for the given item, so the next
     /// <see cref="GetTruthAsync"/> call re-reads from the managed store or sidecar file.

Jellyfin.Plugin.JRay/Services/ManagedTruthStore.cs

@@ -14,6 +14,11 @@ namespace Jellyfin.Plugin.JRay.Services;
 /// Stores truth files pushed directly to JRay (e.g. by a remote extraction
 /// worker) under the plugin's configuration directory, keyed by item id.
 /// </summary>
+/// <remarks>
+/// Deliberately outside the media library filesystem, so a worker that cannot
+/// write beside the media file is not a second-class producer.
+/// </remarks>
+// TRACES: JR-009, JR-010 | PR-004
 public sealed class ManagedTruthStore : IManagedTruthStore
 {
     private static readonly JsonSerializerOptions JsonOptions = new(JsonSerializerDefaults.Web);
@@ -55,7 +60,7 @@ public sealed class ManagedTruthStore : IManagedTruthStore
     }
 
     /// <inheritdoc />
-    public async Task SaveAsync(Guid itemId, TruthFile truth, CancellationToken cancellationToken)
+    public async Task SaveAsync(Guid itemId, TruthFile truth, TruthProvenance provenance, CancellationToken cancellationToken)
     {
         var path = GetPath(itemId);
         var directory = Path.GetDirectoryName(path) ?? throw new InvalidOperationException("Managed truth path has no directory.");
@@ -68,11 +73,52 @@ public sealed class ManagedTruthStore : IManagedTruthStore
         }
 
         File.Move(tempPath, path, overwrite: true);
+
+        // Written after the truth file, so a crash between the two leaves truth
+        // with no provenance (readable, source unknown) rather than provenance
+        // describing a file that is not there.
+        var provenancePath = GetProvenancePath(itemId);
+        var provenanceTemp = provenancePath + ".tmp";
+        using (var stream = File.Create(provenanceTemp))
+        {
+            await JsonSerializer.SerializeAsync(stream, provenance, JsonOptions, cancellationToken).ConfigureAwait(false);
+        }
+
+        File.Move(provenanceTemp, provenancePath, overwrite: true);
+    }
+
+    /// <inheritdoc />
+    public TruthProvenance? LoadProvenance(Guid itemId)
+    {
+        var path = GetProvenancePath(itemId);
+        if (!File.Exists(path))
+        {
+            return null;
+        }
+
+        try
+        {
+            using var stream = File.OpenRead(path);
+            return JsonSerializer.Deserialize<TruthProvenance>(stream, JsonOptions);
+        }
+        catch (Exception ex) when (ex is IOException or JsonException)
+        {
+            // Provenance is metadata about the claim, not the claim. Losing it
+            // must never make readable truth data unreadable.
+            _logger.LogWarning(ex, "JRay: failed to read truth provenance at {Path}", path);
+            return null;
+        }
     }
 
     /// <inheritdoc />
     public bool Delete(Guid itemId)
     {
+        var provenancePath = GetProvenancePath(itemId);
+        if (File.Exists(provenancePath))
+        {
+            File.Delete(provenancePath);
+        }
+
         var path = GetPath(itemId);
         if (!File.Exists(path))
         {
@@ -93,4 +139,9 @@ public sealed class ManagedTruthStore : IManagedTruthStore
     {
         return Path.Combine(_applicationPaths.PluginConfigurationsPath, "JRay", "truth", itemId.ToString("D") + ".json");
     }
+
+    private string GetProvenancePath(Guid itemId)
+    {
+        return Path.Combine(_applicationPaths.PluginConfigurationsPath, "JRay", "truth", itemId.ToString("D") + ".provenance.json");
+    }
 }

Jellyfin.Plugin.JRay/Services/ManifestConverter.cs

@@ -0,0 +1,100 @@
+using System;
+using System.Globalization;
+using Jellyfin.Plugin.JRay.Configuration;
+using Jellyfin.Plugin.JRay.Models;
+
+namespace Jellyfin.Plugin.JRay.Services;
+
+/// <summary>
+/// Converts a fetched manifest into the truth file the plugin stores.
+/// </summary>
+// TRACES: JR-030 | SR-002, SR-003
+public static class ManifestConverter
+{
+    /// <summary>
+    /// Builds a truth file from a manifest, shifting every window by
+    /// <paramref name="offsetSec"/>.
+    /// </summary>
+    /// <remarks>
+    /// <b>The offset is applied here, once, at store time.</b> The server returns
+    /// it and the client applies it, so a single stored manifest serves every
+    /// trim of the same cut without ever being rewritten upstream. Applying it on
+    /// the way in means the stored truth is always in the local file's own
+    /// timebase, so the overlay and the <c>jray?t=</c> query need no offset
+    /// awareness at read time — the alternative would put the same correction in
+    /// every reader, forever, and one of them would eventually forget.
+    /// <para>
+    /// Windows are shifted, never reshaped: a window is a claim about scene
+    /// membership (SR-002), so merging or trimming would answer a different
+    /// question than the one the extraction pipeline answered.
+    /// </para>
+    /// </remarks>
+    /// <param name="manifest">The validated manifest.</param>
+    /// <param name="offsetSec">Seconds to add to every window.</param>
+    /// <param name="mediaPath">Local media path, recorded informationally.</param>
+    /// <returns>The truth file to store.</returns>
+    public static TruthFile ToTruthFile(Jmanifest manifest, double offsetSec, string mediaPath)
+    {
+        ArgumentNullException.ThrowIfNull(manifest);
+
+        var truth = new TruthFile
+        {
+            SchemaVersion = 1,
+            Movie = mediaPath ?? string.Empty,
+            SampleFps = manifest.Extraction?.SampleFps ?? 0,
+        };
+
+        foreach (var actor in manifest.Actors)
+        {
+            var converted = new TruthActor
+            {
+                Name = actor.Name ?? string.Empty,
+                ImdbId = actor.ImdbId ?? string.Empty,
+                TmdbId = actor.TmdbId ?? string.Empty,
+            };
+
+            foreach (var scene in actor.Scenes)
+            {
+                // Clamped at zero: a negative offset on an early window would
+                // otherwise produce a start before the file begins, which no
+                // reader can index.
+                var start = Math.Max(0, scene.Start + offsetSec);
+                var end = Math.Max(start, scene.End + offsetSec);
+                converted.Scenes.Add(new[] { start, end });
+            }
+
+            truth.Actors.Add(converted);
+        }
+
+        return truth;
+    }
+
+    /// <summary>
+    /// A short, human-readable description of how a manifest matched, for the
+    /// UI to show as a caveat.
+    /// </summary>
+    /// <remarks>
+    /// A <c>loose</c> match should surface as a caveat rather than being applied
+    /// silently: it means the runtimes differ by up to 30 seconds, which is
+    /// usually a different trim of the same cut but is not guaranteed to be.
+    /// </remarks>
+    /// <param name="tier">The tier achieved.</param>
+    /// <param name="offsetSec">The offset applied.</param>
+    /// <returns>A caveat string, or null when the match needs no explanation.</returns>
+    public static string? DescribeCaveat(MatchTier tier, double offsetSec)
+    {
+        if (tier == MatchTier.Loose)
+        {
+            return "Matched loosely — the runtime differs from this server's copy, so timings may drift.";
+        }
+
+        if (Math.Abs(offsetSec) > 0.001)
+        {
+            return string.Create(
+                CultureInfo.InvariantCulture,
+                $"Matched by audio content and shifted by {offsetSec:0.##}s to align with this file.");
+        }
+
+        return null;
+    }
+}

Jellyfin.Plugin.JRay/Services/ManifestExchangeClient.cs

@@ -0,0 +1,447 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Net.Http;
+using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
+using Jellyfin.Plugin.JRay.Configuration;
+using Jellyfin.Plugin.JRay.Models;
+using Jellyfin.Plugin.JRay.Services.Interfaces;
+using Microsoft.Extensions.Logging;
+
+namespace Jellyfin.Plugin.JRay.Services;
+
+/// <summary>
+/// Fetches actor-timeline manifests from the configured servers.
+/// </summary>
+/// <remarks>
+/// Servers are an <b>ordered list</b>, and order is the user's trust ranking made
+/// explicit: for a fetch, servers are tried in order and the <i>first acceptable</i>
+/// result wins — acceptable meaning it clears the configured match tier.
+/// <para>
+/// First-match rather than best-match is deliberate. Querying every server for
+/// every item multiplies egress, leaks the library to more parties, and the
+/// ordering already encodes which source the admin prefers. Each configured
+/// server multiplies the privacy exposure described in the server spec §9, so
+/// later servers are queried only for what earlier ones lacked.
+/// </para>
+/// </remarks>
+// TRACES: JR-025, JR-029, JR-030, JR-037 | PR-005, PR-006
+public class ManifestExchangeClient : IManifestExchangeClient, IDisposable
+{
+    /// <summary>Server spec §9: a single manifest response is capped at 2 MiB.</summary>
+    public const long MaxManifestBytes = 2 * 1024 * 1024;
+
+    /// <summary>Server spec §9: a bundle response is capped at 25 MiB.</summary>
+    public const long MaxBundleBytes = 25L * 1024 * 1024;
+
+    private static readonly TimeSpan ConnectTimeout = TimeSpan.FromSeconds(5);
+    private static readonly TimeSpan ReadTimeout = TimeSpan.FromSeconds(30);
+
+    /// <summary>
+    /// How long a server that failed is skipped for, doubling each consecutive
+    /// failure. One dead server must never stall a library sweep.
+    /// </summary>
+    private static readonly TimeSpan BaseBackoff = TimeSpan.FromMinutes(1);
+    private static readonly TimeSpan MaxBackoff = TimeSpan.FromHours(1);
+
+    private readonly HttpClient _http;
+    private readonly ILogger<ManifestExchangeClient> _logger;
+    private readonly ConcurrentDictionary<string, ServerHealth> _health = new(StringComparer.Ordinal);
+    private readonly bool _ownsClient;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="ManifestExchangeClient"/> class.
+    /// </summary>
+    /// <param name="logger">Logger.</param>
+    public ManifestExchangeClient(ILogger<ManifestExchangeClient> logger)
+        : this(logger, null)
+    {
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="ManifestExchangeClient"/> class
+    /// with an injected transport, for testing.
+    /// </summary>
+    /// <param name="logger">Logger.</param>
+    /// <param name="httpClient">Transport to use, or null to build the default.</param>
+    public ManifestExchangeClient(ILogger<ManifestExchangeClient> logger, HttpClient? httpClient)
+    {
+        _logger = logger;
+        _ownsClient = httpClient is null;
+        _http = httpClient ?? new HttpClient(new SocketsHttpHandler
+        {
+            ConnectTimeout = ConnectTimeout,
+            // Certificate validation is never disabled: a plaintext or
+            // unverified server would let any network intermediary rewrite
+            // actor overlays.
+            AutomaticDecompression = System.Net.DecompressionMethods.All,
+        })
+        {
+            Timeout = ReadTimeout,
+        };
+    }
+
+    /// <inheritdoc />
+    public async Task<ManifestFetchOutcome?> FetchMovieAsync(
+        IReadOnlyList<ManifestServer> servers,
+        MatchTier minimumTier,
+        TitleQuery query,
+        CancellationToken cancellationToken)
+    {
+        ArgumentNullException.ThrowIfNull(servers);
+        ArgumentNullException.ThrowIfNull(query);
+
+        foreach (var server in Eligible(servers))
+        {
+            var url = BuildUrl(server, "manifests/movie", query);
+            if (url is null)
+            {
+                continue;
+            }
+
+            var outcome = await TryFetchOneAsync(server, url, query, minimumTier, cancellationToken)
+                .ConfigureAwait(false);
+            if (outcome is not null)
+            {
+                // First acceptable result wins — no further servers are queried,
+                // which is what bounds the privacy exposure.
+                return outcome;
+            }
+        }
+
+        return null;
+    }
+
+    /// <inheritdoc />
+    public async Task<ManifestFetchOutcome?> FetchEpisodeAsync(
+        IReadOnlyList<ManifestServer> servers,
+        MatchTier minimumTier,
+        TitleQuery query,
+        CancellationToken cancellationToken)
+    {
+        ArgumentNullException.ThrowIfNull(servers);
+        ArgumentNullException.ThrowIfNull(query);
+
+        foreach (var server in Eligible(servers))
+        {
+            var url = BuildUrl(server, "manifests/episode", query);
+            if (url is null)
+            {
+                continue;
+            }
+
+            var outcome = await TryFetchOneAsync(server, url, query, minimumTier, cancellationToken)
+                .ConfigureAwait(false);
+            if (outcome is not null)
+            {
+                return outcome;
+            }
+        }
+
+        return null;
+    }
+
+    /// <inheritdoc />
+    public IReadOnlyList<ServerStatus> GetStatus(IReadOnlyList<ManifestServer> servers)
+    {
+        ArgumentNullException.ThrowIfNull(servers);
+
+        return servers.Select(s =>
+        {
+            _health.TryGetValue(s.Url, out var h);
+            return new ServerStatus
+            {
+                Url = s.Url,
+                Name = s.Name,
+                Enabled = s.Enabled,
+                Reachable = h is null || h.ConsecutiveFailures == 0,
+                LastError = h?.LastError,
+                SkippedUntil = h?.SkipUntil,
+            };
+        }).ToList();
+    }
+
+    /// <summary>
+    /// Servers that are enabled and not currently in backoff, in configured order.
+    /// </summary>
+    private IEnumerable<ManifestServer> Eligible(IReadOnlyList<ManifestServer> servers)
+    {
+        var now = DateTimeOffset.UtcNow;
+        foreach (var s in servers)
+        {
+            if (!s.Enabled || string.IsNullOrWhiteSpace(s.Url))
+            {
+                continue;
+            }
+
+            if (_health.TryGetValue(s.Url, out var h) && h.SkipUntil > now)
+            {
+                _logger.LogDebug("Skipping {Url} until {Until} after {Failures} failures", s.Url, h.SkipUntil, h.ConsecutiveFailures);
+                continue;
+            }
+
+            yield return s;
+        }
+    }
+
+    private async Task<ManifestFetchOutcome?> TryFetchOneAsync(
+        ManifestServer server,
+        Uri url,
+        TitleQuery query,
+        MatchTier minimumTier,
+        CancellationToken cancellationToken)
+    {
+        try
+        {
+            using var response = await _http
+                .GetAsync(url, HttpCompletionOption.ResponseHeadersRead, cancellationToken)
+                .ConfigureAwait(false);
+
+            if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
+            {
+                // Not an error: this server simply does not hold it. The next
+                // server in the list gets a turn.
+                RecordSuccess(server.Url);
+                return null;
+            }
+
+            if (!response.IsSuccessStatusCode)
+            {
+                RecordFailure(server.Url, $"HTTP {(int)response.StatusCode}");
+                return null;
+            }
+
+            var json = await ReadCappedAsync(response, MaxManifestBytes, cancellationToken)
+                .ConfigureAwait(false);
+            if (json is null)
+            {
+                RecordFailure(server.Url, "response exceeded the size cap");
+                return null;
+            }
+
+            var body = JsonSerializer.Deserialize<ManifestFetchResponse>(json);
+            RecordSuccess(server.Url);
+
+            if (body?.Manifest is null)
+            {
+                return null;
+            }
+
+            var tier = ParseTier(body.Match);
+            if (tier is null || tier < minimumTier)
+            {
+                _logger.LogDebug(
+                    "{Url} matched at {Tier}, below the configured minimum {Minimum}",
+                    server.Url,
+                    body.Match,
+                    minimumTier);
+                return null;
+            }
+
+            if (!ManifestValidator.TryValidate(body.Manifest, query.RuntimeSec, out var error))
+            {
+                // A manifest is never trusted merely because a server served it.
+                _logger.LogWarning("Rejected manifest from {Url}: {Error}", server.Url, error);
+                return null;
+            }
+
+            return new ManifestFetchOutcome
+            {
+                ServerUrl = server.Url,
+                Tier = tier.Value,
+                OffsetSec = body.OffsetSec,
+                Manifest = body.Manifest,
+            };
+        }
+        catch (OperationCanceledException) when (cancellationToken.IsCancellationRequested)
+        {
+            throw;
+        }
+        catch (Exception ex) when (ex is HttpRequestException or TaskCanceledException or JsonException)
+        {
+            // A slow, unreachable or nonsense-returning server is skipped and
+            // backed off; it must never stall the sweep or fail the whole fetch.
+            RecordFailure(server.Url, ex.Message);
+            return null;
+        }
+    }
+
+    /// <summary>
+    /// Reads a response body, aborting once it exceeds <paramref name="cap"/>.
+    /// </summary>
+    /// <remarks>
+    /// Capped <b>while streaming</b> rather than after buffering: a hostile
+    /// server can declare any <c>Content-Length</c> it likes, so reading to
+    /// completion and then measuring is exactly the denial-of-service primitive
+    /// the cap exists to prevent.
+    /// </remarks>
+    private static async Task<string?> ReadCappedAsync(
+        HttpResponseMessage response,
+        long cap,
+        CancellationToken cancellationToken)
+    {
+        // The declared length is a cheap early rejection, never the enforcement.
+        if (response.Content.Headers.ContentLength is { } declared && declared > cap)
+        {
+            return null;
+        }
+
+        using var stream = await response.Content.ReadAsStreamAsync(cancellationToken).ConfigureAwait(false);
+        var buffer = new byte[8192];
+        using var accumulated = new System.IO.MemoryStream();
+
+        while (true)
+        {
+            var read = await stream.ReadAsync(buffer, cancellationToken).ConfigureAwait(false);
+            if (read == 0)
+            {
+                break;
+            }
+
+            if (accumulated.Length + read > cap)
+            {
+                return null;
+            }
+
+            await accumulated.WriteAsync(buffer.AsMemory(0, read), cancellationToken).ConfigureAwait(false);
+        }
+
+        return System.Text.Encoding.UTF8.GetString(accumulated.ToArray());
+    }
+
+    /// <summary>
+    /// Builds a fetch URL, or null when the server's URL is unusable.
+    /// </summary>
+    /// <remarks>
+    /// <b>HTTPS is required for anything that is not loopback.</b> A plaintext
+    /// community server would let any network intermediary rewrite actor
+    /// overlays, and the overlay is displayed to the user as fact.
+    /// </remarks>
+    /// <param name="server">The configured server.</param>
+    /// <param name="path">API path below <c>/api/v1/</c>.</param>
+    /// <param name="query">Identity and cut parameters.</param>
+    /// <returns>The URL to request, or null when the server URL is unusable.</returns>
+    internal static Uri? BuildUrl(ManifestServer server, string path, TitleQuery query)
+    {
+        ArgumentNullException.ThrowIfNull(server);
+        ArgumentNullException.ThrowIfNull(query);
+
+        if (!Uri.TryCreate(server.Url, UriKind.Absolute, out var baseUri))
+        {
+            return null;
+        }
+
+        if (!IsTransportAcceptable(baseUri))
+        {
+            return null;
+        }
+
+        var q = query.ToQueryString();
+        var trimmed = baseUri.AbsoluteUri.TrimEnd('/');
+        return Uri.TryCreate($"{trimmed}/api/v1/{path}?{q}", UriKind.Absolute, out var built)
+            ? built
+            : null;
+    }
+
+    /// <summary>
+    /// True when the URL may be used: HTTPS anywhere, or HTTP on loopback only.
+    /// </summary>
+    /// <param name="uri">The server base URL.</param>
+    /// <returns><c>true</c> when the transport is acceptable.</returns>
+    internal static bool IsTransportAcceptable(Uri uri)
+    {
+        ArgumentNullException.ThrowIfNull(uri);
+
+        if (uri.Scheme == Uri.UriSchemeHttps)
+        {
+            return true;
+        }
+
+        if (uri.Scheme != Uri.UriSchemeHttp)
+        {
+            return false;
+        }
+
+        // Loopback is exempt because there is no network path to intercept.
+        return uri.IsLoopback;
+    }
+
+    /// <summary>Parses a tier name the server reported.</summary>
+    /// <param name="tier">The tier string.</param>
+    /// <returns>The tier, or null when unrecognised.</returns>
+    internal static MatchTier? ParseTier(string? tier) => tier switch
+    {
+        // `exact` is deliberately absent: the file-hash tier is withdrawn on
+        // legal grounds (see MatchTier). A server cannot report it to us anyway,
+        // since we send no `video_hash` — and if one did, treating it as
+        // unrecognised means the manifest is declined rather than silently
+        // accepted under a tier this plugin has no policy for.
+        "audio" => MatchTier.Audio,
+        "runtime" => MatchTier.Runtime,
+        "loose" => MatchTier.Loose,
+        _ => null,
+    };
+
+    private void RecordSuccess(string url) => _health.TryRemove(url, out _);
+
+    private void RecordFailure(string url, string error)
+    {
+        var updated = _health.AddOrUpdate(
+            url,
+            _ => new ServerHealth { ConsecutiveFailures = 1, LastError = error, SkipUntil = DateTimeOffset.UtcNow + BaseBackoff },
+            (_, existing) =>
+            {
+                var failures = existing.ConsecutiveFailures + 1;
+                // Exponential, capped: a server that is down for a day should
+                // not be retried every minute for that whole day.
+                var delayTicks = Math.Min(
+                    BaseBackoff.Ticks * (long)Math.Pow(2, Math.Min(failures - 1, 6)),
+                    MaxBackoff.Ticks);
+                return new ServerHealth
+                {
+                    ConsecutiveFailures = failures,
+                    LastError = error,
+                    SkipUntil = DateTimeOffset.UtcNow + TimeSpan.FromTicks(delayTicks),
+                };
+            });
+
+        _logger.LogWarning(
+            "Server {Url} failed ({Failures} consecutive): {Error}. Skipping until {Until}",
+            url,
+            updated.ConsecutiveFailures,
+            error,
+            updated.SkipUntil);
+    }
+
+    /// <inheritdoc />
+    public void Dispose()
+    {
+        Dispose(true);
+        GC.SuppressFinalize(this);
+    }
+
+    /// <summary>
+    /// Releases the transport when this instance created it.
+    /// </summary>
+    /// <param name="disposing">Whether managed resources should be released.</param>
+    protected virtual void Dispose(bool disposing)
+    {
+        if (disposing && _ownsClient)
+        {
+            _http.Dispose();
+        }
+    }
+
+    private sealed class ServerHealth
+    {
+        public int ConsecutiveFailures { get; init; }
+
+        public string? LastError { get; init; }
+
+        public DateTimeOffset SkipUntil { get; init; }
+    }
+}

Jellyfin.Plugin.JRay/Services/ManifestFetchOutcome.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using Jellyfin.Plugin.JRay.Configuration;
+using Jellyfin.Plugin.JRay.Models;
+
+namespace Jellyfin.Plugin.JRay.Services;
+
+/// <summary>A manifest accepted from a server.</summary>
+public class ManifestFetchOutcome
+{
+    /// <summary>Gets or sets which server supplied it.</summary>
+    public string ServerUrl { get; set; } = string.Empty;
+
+    /// <summary>Gets or sets the cut-match tier achieved.</summary>
+    public MatchTier Tier { get; set; }
+
+    /// <summary>Gets or sets the offset the client must apply to every window.</summary>
+    public double OffsetSec { get; set; }
+
+    /// <summary>Gets or sets the manifest.</summary>
+    public Jmanifest? Manifest { get; set; }
+}

Jellyfin.Plugin.JRay/Services/ManifestValidator.cs

@@ -0,0 +1,256 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using Jellyfin.Plugin.JRay.Models;
+
+namespace Jellyfin.Plugin.JRay.Services;
+
+/// <summary>
+/// Re-validates a manifest received from a server.
+/// </summary>
+/// <remarks>
+/// <b>Every server is untrusted, including the pre-configured community one.</b>
+/// Everything the server specification guarantees is a property of a *correctly
+/// operated* server; pointing the plugin at an arbitrary URL inherits none of
+/// it. So the plugin re-applies client-side what the server applies on upload:
+/// unknown-shaped data rejected, identifiers format-checked, windows
+/// bounds-checked against the item's real runtime.
+/// <para>
+/// The honest framing for the configuration page is that adding a third-party
+/// server means trusting its operator not to serve you deliberately wrong actor
+/// data. These checks bound the damage to bad overlay content; they cannot make
+/// wrong data right.
+/// </para>
+/// </remarks>
+// TRACES: JR-027 | SR-004
+public static class ManifestValidator
+{
+    /// <summary>The exchange envelope version this plugin speaks (SR-003).</summary>
+    public const int SupportedJmanifestVersion = 2;
+
+    /// <summary>Server spec §6: no more than 500 actors in one manifest.</summary>
+    public const int MaxActors = 500;
+
+    /// <summary>Server spec §6: no more than 2000 windows for one actor.</summary>
+    public const int MaxScenesPerActor = 2000;
+
+    /// <summary>Server spec §6: no more than 20000 windows in total.</summary>
+    public const int MaxTotalScenes = 20000;
+
+    /// <summary>Server spec §6: names are capped at 200 characters.</summary>
+    public const int MaxNameLength = 200;
+
+    /// <summary>
+    /// Windows may exceed the measured runtime by this much before being
+    /// rejected, covering rounding and container-duration disagreement.
+    /// </summary>
+    public const double RuntimeToleranceSec = 5.0;
+
+    /// <summary>
+    /// Validates a manifest against the local item's measured runtime.
+    /// </summary>
+    /// <param name="manifest">The manifest as received.</param>
+    /// <param name="localRuntimeSec">
+    /// The runtime of the local file, or null when it is not known. Windows are
+    /// bounds-checked against it when it is available.
+    /// </param>
+    /// <param name="error">The first problem found, naming the offending field.</param>
+    /// <returns><c>true</c> when the manifest is safe to store.</returns>
+    public static bool TryValidate(Jmanifest? manifest, double? localRuntimeSec, out string error)
+    {
+        if (manifest is null)
+        {
+            error = "manifest: absent";
+            return false;
+        }
+
+        // An unknown envelope version is refused, never guessed at (JR-003).
+        // A server one version ahead may have changed the meaning of a field
+        // this plugin thinks it understands.
+        if (manifest.JmanifestVersion != SupportedJmanifestVersion)
+        {
+            error = string.Create(
+                CultureInfo.InvariantCulture,
+                $"jmanifest_version: unsupported version {manifest.JmanifestVersion}, expected {SupportedJmanifestVersion}");
+            return false;
+        }
+
+        if (manifest.Identity is null)
+        {
+            error = "identity: absent";
+            return false;
+        }
+
+        if (manifest.Cut is null || !IsSaneRuntime(manifest.Cut.RuntimeSec))
+        {
+            error = "cut.runtime_sec: absent or not a plausible duration";
+            return false;
+        }
+
+        if (manifest.Actors.Count == 0)
+        {
+            error = "actors: empty";
+            return false;
+        }
+
+        if (manifest.Actors.Count > MaxActors)
+        {
+            error = string.Create(
+                CultureInfo.InvariantCulture,
+                $"actors: more than {MaxActors} entries");
+            return false;
+        }
+
+        // Bounds are checked against the *local* file where known, because that
+        // is what the overlay will index into. A window past the end of the file
+        // is not merely useless, it is evidence the manifest is for another cut.
+        var limit = (localRuntimeSec ?? manifest.Cut.RuntimeSec) + RuntimeToleranceSec;
+
+        var total = 0;
+        var seenTmdb = new HashSet<string>(StringComparer.Ordinal);
+
+        for (var i = 0; i < manifest.Actors.Count; i++)
+        {
+            var actor = manifest.Actors[i];
+
+            if (actor.Name is { Length: > MaxNameLength })
+            {
+                error = string.Create(CultureInfo.InvariantCulture, $"actors[{i}].name: too long");
+                return false;
+            }
+
+            if (actor.Name is not null && ContainsControlCharacters(actor.Name))
+            {
+                error = string.Create(
+                    CultureInfo.InvariantCulture,
+                    $"actors[{i}].name: contains control characters");
+                return false;
+            }
+
+            if (actor.TmdbId is { Length: > 0 } tmdb)
+            {
+                if (!IsDigits(tmdb, 9))
+                {
+                    error = string.Create(
+                        CultureInfo.InvariantCulture,
+                        $"actors[{i}].tmdb_id: not a TMDB id");
+                    return false;
+                }
+
+                if (!seenTmdb.Add(tmdb))
+                {
+                    error = string.Create(
+                        CultureInfo.InvariantCulture,
+                        $"actors[{i}].tmdb_id: duplicate actor");
+                    return false;
+                }
+            }
+
+            if (actor.ImdbId is { Length: > 0 } imdb && !IsPersonImdbId(imdb))
+            {
+                error = string.Create(
+                    CultureInfo.InvariantCulture,
+                    $"actors[{i}].imdb_id: not an IMDB person id");
+                return false;
+            }
+
+            if (actor.Scenes.Count > MaxScenesPerActor)
+            {
+                error = string.Create(
+                    CultureInfo.InvariantCulture,
+                    $"actors[{i}].scenes: more than {MaxScenesPerActor} entries");
+                return false;
+            }
+
+            total += actor.Scenes.Count;
+            if (total > MaxTotalScenes)
+            {
+                error = string.Create(
+                    CultureInfo.InvariantCulture,
+                    $"actors: more than {MaxTotalScenes} windows in total");
+                return false;
+            }
+
+            for (var j = 0; j < actor.Scenes.Count; j++)
+            {
+                var scene = actor.Scenes[j];
+                if (!IsFinite(scene.Start) || !IsFinite(scene.End))
+                {
+                    error = string.Create(
+                        CultureInfo.InvariantCulture,
+                        $"actors[{i}].scenes[{j}]: non-finite value");
+                    return false;
+                }
+
+                if (scene.Start < 0 || scene.End < scene.Start)
+                {
+                    error = string.Create(
+                        CultureInfo.InvariantCulture,
+                        $"actors[{i}].scenes[{j}]: negative or inverted window");
+                    return false;
+                }
+
+                if (scene.End > limit)
+                {
+                    error = string.Create(
+                        CultureInfo.InvariantCulture,
+                        $"actors[{i}].scenes[{j}]: ends beyond the item's runtime");
+                    return false;
+                }
+
+                // A posterior outside [0, 1] is not a probability.
+                if (scene.Belief is { } b && (!IsFinite(b) || b < 0 || b > 1))
+                {
+                    error = string.Create(
+                        CultureInfo.InvariantCulture,
+                        $"actors[{i}].scenes[{j}].belief: outside [0, 1]");
+                    return false;
+                }
+            }
+        }
+
+        error = string.Empty;
+        return true;
+    }
+
+    private static bool IsSaneRuntime(double v) => IsFinite(v) && v > 0 && v < 200_000;
+
+    private static bool IsFinite(double v) => !double.IsNaN(v) && !double.IsInfinity(v);
+
+    private static bool IsDigits(string s, int maxLength) =>
+        s.Length > 0 && s.Length <= maxLength && s.All(char.IsAsciiDigit);
+
+    private static bool IsPersonImdbId(string s) =>
+        s.StartsWith("nm", StringComparison.Ordinal)
+        && (s.Length == 9 || s.Length == 10)
+        && s.AsSpan(2).ToString().All(char.IsAsciiDigit);
+
+    /// <summary>
+    /// Control characters are refused outright. The overlay renders names as
+    /// text nodes (JR-024), so markup is already inert, but a bidi override or a
+    /// zero-width joiner can still make a name display as something other than
+    /// what was stored.
+    /// </summary>
+    private static bool ContainsControlCharacters(string s)
+    {
+        foreach (var c in s)
+        {
+            if (char.IsControl(c))
+            {
+                return true;
+            }
+
+            // Zero-width and bidi-control codepoints.
+            if (c is >= '​' and <= '‏'
+                or >= '‪' and <= '‮'
+                or >= '⁦' and <= '⁩'
+                or '')
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}

Jellyfin.Plugin.JRay/Services/MediaPolicyStore.cs

@@ -17,6 +17,7 @@ namespace Jellyfin.Plugin.JRay.Services;
 /// reads. All access is synchronised so the work-discovery API and the
 /// config page can touch it concurrently.
 /// </summary>
+// TRACES: JR-016 | PR-003
 public sealed class MediaPolicyStore : IMediaPolicyStore
 {
     private static readonly JsonSerializerOptions JsonOptions = new(JsonSerializerDefaults.Web)

Jellyfin.Plugin.JRay/Services/PolicyResolver.cs

@@ -11,6 +11,7 @@ namespace Jellyfin.Plugin.JRay.Services;
 /// hold only one action, the only conflicts possible are across scopes, and
 /// specificity resolves those.
 /// </summary>
+// TRACES: JR-016 | PR-003
 public static class PolicyResolver
 {
     /// <summary>

Jellyfin.Plugin.JRay/Services/PresenceLookup.cs

@@ -0,0 +1,119 @@
+using System.Collections.Generic;
+using Jellyfin.Plugin.JRay.Models;
+
+namespace Jellyfin.Plugin.JRay.Services;
+
+/// <summary>
+/// Answers "which actors are in the scene at time <c>t</c>" from a truth file.
+/// </summary>
+/// <remarks>
+/// This is the unit that decides presence, so the scene-scoped semantics live
+/// here rather than being spread through the controller.
+///
+/// <para>
+/// <b>A window is a claim about scene membership, not a recognition event.</b>
+/// An actor who turns away, is occluded, or is off-camera while the shot cuts to
+/// whoever they are speaking to is still present. Two windows mean a genuine
+/// departure and return, not a break in detection — so this code reads windows
+/// exactly as given and never merges, splits, trims, or reorders them.
+/// </para>
+/// <para>
+/// Bounds are inclusive at both ends, matching the format's definition. That
+/// makes adjacent windows such as <c>[0,10]</c> and <c>[10,20]</c> both contain
+/// <c>t = 10</c>; reporting the actor present once is correct, and is not a
+/// reason to merge the windows.
+/// </para>
+/// </remarks>
+// TRACES: JR-004, JR-005, JR-006 | SR-002
+public static class PresenceLookup
+{
+    /// <summary>
+    /// Determines whether an actor is present in the scene at <paramref name="t"/>.
+    /// </summary>
+    /// <param name="actor">The actor entry from a truth file.</param>
+    /// <param name="t">The timestamp, in seconds.</param>
+    /// <returns><c>true</c> when any window contains <paramref name="t"/>.</returns>
+    public static bool IsPresentAt(TruthActor actor, double t)
+    {
+        if (actor is null)
+        {
+            return false;
+        }
+
+        // A full scan, deliberately: windows may be numerous, but correctness
+        // must not depend on the producer having honoured the sortedness
+        // guarantee. An early exit on `start > t` would be faster and would
+        // silently under-report the moment one file arrived out of order —
+        // trading a correctness risk for a saving that does not matter at this
+        // scale (see JR-006).
+        foreach (var window in actor.Scenes)
+        {
+            if (window.Length == 2 && window[0] <= t && t <= window[1])
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /// <summary>
+    /// Lists the actors present in the scene at <paramref name="t"/>, in the
+    /// order the truth file lists them.
+    /// </summary>
+    /// <param name="truth">The truth file.</param>
+    /// <param name="t">The timestamp, in seconds.</param>
+    /// <returns>The actors whose windows contain <paramref name="t"/>.</returns>
+    public static IEnumerable<TruthActor> ActorsPresentAt(TruthFile truth, double t)
+    {
+        if (truth is null)
+        {
+            yield break;
+        }
+
+        foreach (var actor in truth.Actors)
+        {
+            if (IsPresentAt(actor, t))
+            {
+                yield return actor;
+            }
+        }
+    }
+
+    /// <summary>
+    /// Determines whether an actor's windows are sorted by start time, as the
+    /// truth-file format requires of producers.
+    /// </summary>
+    /// <remarks>
+    /// Presence lookup does not depend on this — it is a diagnostic. A file that
+    /// fails it is still read correctly, but it signals a producer bug worth
+    /// surfacing rather than absorbing silently.
+    /// </remarks>
+    /// <param name="actor">The actor entry from a truth file.</param>
+    /// <returns><c>true</c> when every window starts at or after its predecessor.</returns>
+    public static bool WindowsAreSorted(TruthActor actor)
+    {
+        if (actor is null)
+        {
+            return true;
+        }
+
+        double previousStart = double.NegativeInfinity;
+        foreach (var window in actor.Scenes)
+        {
+            if (window.Length != 2)
+            {
+                continue;
+            }
+
+            if (window[0] < previousStart)
+            {
+                return false;
+            }
+
+            previousStart = window[0];
+        }
+
+        return true;
+    }
+}

Jellyfin.Plugin.JRay/Services/ServerStatus.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using Jellyfin.Plugin.JRay.Configuration;
+using Jellyfin.Plugin.JRay.Models;
+
+namespace Jellyfin.Plugin.JRay.Services;
+
+/// <summary>Per-server reachability, for the configuration page.</summary>
+public class ServerStatus
+{
+    /// <summary>Gets or sets the server's base URL.</summary>
+    public string Url { get; set; } = string.Empty;
+
+    /// <summary>Gets or sets the display name.</summary>
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>Gets or sets a value indicating whether the server is enabled.</summary>
+    public bool Enabled { get; set; }
+
+    /// <summary>Gets or sets a value indicating whether the last attempt succeeded.</summary>
+    public bool Reachable { get; set; }
+
+    /// <summary>Gets or sets the last error seen, if any.</summary>
+    public string? LastError { get; set; }
+
+    /// <summary>Gets or sets when this server will next be tried.</summary>
+    public DateTimeOffset? SkippedUntil { get; set; }
+}

Jellyfin.Plugin.JRay/Services/TitleQuery.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using Jellyfin.Plugin.JRay.Configuration;
+using Jellyfin.Plugin.JRay.Models;
+
+namespace Jellyfin.Plugin.JRay.Services;
+
+/// <summary>Identity and cut parameters for a fetch.</summary>
+public class TitleQuery
+{
+    /// <summary>Gets or sets the movie's TMDB id.</summary>
+    public string? TmdbId { get; set; }
+
+    /// <summary>Gets or sets the movie's IMDB id.</summary>
+    public string? ImdbId { get; set; }
+
+    /// <summary>Gets or sets the series TMDB id, for an episode.</summary>
+    public string? SeriesTmdbId { get; set; }
+
+    /// <summary>Gets or sets the season number, for an episode.</summary>
+    public int? Season { get; set; }
+
+    /// <summary>Gets or sets the episode number, for an episode.</summary>
+    public int? Episode { get; set; }
+
+    /// <summary>Gets or sets the local file's measured runtime, in seconds.</summary>
+    public double? RuntimeSec { get; set; }
+
+    /// <summary>Renders the query parameters the server expects.</summary>
+    /// <remarks>
+    /// There is deliberately no <c>video_hash</c> parameter. The file-hash tier
+    /// is withdrawn on legal grounds (see <see cref="MatchTier"/>), and omitting
+    /// the field here is what makes that structural: there is nothing to send,
+    /// so no future caller can start sending one by setting a property.
+    /// </remarks>
+    /// <returns>An escaped query string, without the leading '?'.</returns>
+    public string ToQueryString()
+    {
+        var parts = new List<string>();
+        void Add(string key, string? value)
+        {
+            if (!string.IsNullOrEmpty(value))
+            {
+                parts.Add($"{key}={Uri.EscapeDataString(value)}");
+            }
+        }
+
+        Add("tmdb_id", TmdbId);
+        Add("imdb_id", ImdbId);
+        Add("series_tmdb_id", SeriesTmdbId);
+        Add("season", Season?.ToString(CultureInfo.InvariantCulture));
+        Add("episode", Episode?.ToString(CultureInfo.InvariantCulture));
+        Add("runtime_sec", RuntimeSec?.ToString("0.###", CultureInfo.InvariantCulture));
+        return string.Join('&', parts);
+    }
+}

Jellyfin.Plugin.JRay/Services/TruthDataService.cs

@@ -16,6 +16,13 @@ namespace Jellyfin.Plugin.JRay.Services;
 /// item's source file, and caches the parsed result for a configurable
 /// duration.
 /// </summary>
+/// <remarks>
+/// Managed truth — pushed by a worker, or fetched from a manifest server —
+/// takes precedence over a sidecar file. Storing fetched manifests through the
+/// managed store is what keeps this a two-way rule rather than a three-way one,
+/// so the read path never learns that the exchange exists.
+/// </remarks>
+// TRACES: JR-008, JR-010, JR-011 | PR-001
 public sealed class TruthDataService : ITruthDataService
 {
     private static readonly JsonSerializerOptions JsonOptions = new(JsonSerializerDefaults.Web);
@@ -86,6 +93,34 @@ public sealed class TruthDataService : ITruthDataService
         }
     }
 
+    /// <inheritdoc />
+    public TruthProvenance? GetProvenance(Guid itemId)
+    {
+        // Managed truth wins, exactly as in GetTruthAsync -- resolving
+        // precedence twice by different rules is how the two would drift.
+        var managed = _managedTruthStore.LoadProvenance(itemId);
+        if (managed is not null)
+        {
+            return managed;
+        }
+
+        var item = _libraryManager.GetItemById(itemId);
+        if (item is null || string.IsNullOrEmpty(item.Path))
+        {
+            return null;
+        }
+
+        var sidecarPath = GetSidecarPath(item.Path);
+        if (!File.Exists(sidecarPath))
+        {
+            return null;
+        }
+
+        // A sidecar records nothing about itself, so its provenance is derived:
+        // it is local, and its timestamp is the file's own.
+        return TruthProvenance.Local(TruthSource.Sidecar, File.GetLastWriteTimeUtc(sidecarPath));
+    }
+
     /// <inheritdoc />
     public void Invalidate(Guid itemId)
     {

Jellyfin.Plugin.JRay/Services/WebClientPatchService.cs

@@ -6,26 +6,40 @@ using Microsoft.Extensions.Logging;
 namespace Jellyfin.Plugin.JRay.Services;
 
 /// <summary>
-/// Injects (or removes) a script tag in the web client's <c>index.html</c>
-/// that loads JRay's pause-overlay script. This follows the pattern used by
-/// other Jellyfin plugins (e.g. Intro Skipper) since there is no official
-/// plugin hook for player-overlay UI.
+/// Removes the pause-overlay script tag that an earlier version of JRay
+/// injected into the web client's <c>index.html</c> on disk.
 /// </summary>
+/// <remarks>
+/// <b>This class cannot inject.</b> JRay reaches the web client only through
+/// <see cref="FileTransformationRegistration"/>, which rewrites
+/// <c>index.html</c> as it is served. Patching the file on disk was removed
+/// rather than left switched off: the patch outlives an uninstall, a web-client
+/// upgrade discards it silently, and it races any other plugin patching the same
+/// file. An unreachable write path is also the one nobody runs, which is the one
+/// a later refactor re-enables by accident.
+///
+/// Removal remains because users upgrading from a version that did patch the
+/// file must not be left with a stale injection pointing at endpoints that have
+/// since changed. It keys on JRay's own <c>&lt;!-- jray-overlay --&gt;</c>
+/// marker, so it is unambiguous and touches nothing another plugin added.
+/// </remarks>
+// TRACES: JR-021, JR-022 | PR-004
 public static class WebClientPatchService
 {
     private const string Marker = "<!-- jray-overlay -->";
     private const string ScriptTag = "<script defer src=\"/Plugins/JRay/ClientScript\"></script>";
-    private const string Injected = ScriptTag + Marker + "\n</body>";
 
     /// <summary>
-    /// Ensures the web client's index.html either has or does not have the
-    /// JRay overlay script injected, matching <paramref name="enableOverlay"/>.
+    /// Removes a legacy on-disk overlay injection, if one is present. Safe to
+    /// call on every startup: it is a no-op once the marker is gone.
     /// </summary>
     /// <param name="applicationPaths">The Jellyfin application paths.</param>
-    /// <param name="enableOverlay">Whether the overlay script should be present.</param>
     /// <param name="logger">The logger.</param>
-    public static void Apply(IApplicationPaths applicationPaths, bool enableOverlay, ILogger logger)
+    public static void RemoveLegacyPatch(IApplicationPaths applicationPaths, ILogger logger)
     {
+        ArgumentNullException.ThrowIfNull(applicationPaths);
+        ArgumentNullException.ThrowIfNull(logger);
+
         var indexPath = Path.Combine(applicationPaths.WebPath, "index.html");
 
         try
@@ -37,36 +51,38 @@ public static class WebClientPatchService
             }
 
             var html = File.ReadAllText(indexPath);
-            var hasMarker = html.Contains(Marker, StringComparison.Ordinal);
+            if (!html.Contains(Marker, StringComparison.Ordinal))
+            {
+                return;
+            }
 
-            if (enableOverlay && !hasMarker)
-            {
-                var patched = ReplaceLast(html, "</body>", Injected);
-                File.WriteAllText(indexPath, patched);
-                logger.LogInformation("JRay: injected pause-overlay script into {Path}", indexPath);
-            }
-            else if (!enableOverlay && hasMarker)
-            {
-                var patched = html.Replace(ScriptTag + Marker + "\n", string.Empty, StringComparison.Ordinal)
-                    .Replace(ScriptTag + Marker, string.Empty, StringComparison.Ordinal);
-                File.WriteAllText(indexPath, patched);
-                logger.LogInformation("JRay: removed pause-overlay script from {Path}", indexPath);
-            }
+            var cleaned = RemoveInjection(html);
+            File.WriteAllText(indexPath, cleaned);
+            logger.LogInformation(
+                "JRay: removed a pause-overlay script left in {Path} by an earlier version. "
+                + "JRay no longer modifies this file; the overlay is served through File Transformation.",
+                indexPath);
         }
         catch (Exception ex) when (ex is IOException or UnauthorizedAccessException)
         {
-            logger.LogWarning(ex, "JRay: failed to patch web client index.html at {Path}", indexPath);
+            logger.LogWarning(ex, "JRay: failed to remove the legacy overlay patch from {Path}", indexPath);
         }
     }
 
-    private static string ReplaceLast(string source, string find, string replace)
+    /// <summary>
+    /// Strips the marked script tag from the document.
+    /// </summary>
+    /// <param name="html">The document contents.</param>
+    /// <returns>The contents with JRay's injection removed.</returns>
+    internal static string RemoveInjection(string html)
     {
-        var index = source.LastIndexOf(find, StringComparison.Ordinal);
-        if (index < 0)
-        {
-            return source;
-        }
+        ArgumentNullException.ThrowIfNull(html);
 
-        return source[..index] + replace + source[(index + find.Length)..];
+        // The trailing newline is stripped with the tag when present, so removing
+        // a patch restores the document byte-for-byte rather than leaving a blank
+        // line that accumulates across upgrades.
+        return html
+            .Replace(ScriptTag + Marker + "\n", string.Empty, StringComparison.Ordinal)
+            .Replace(ScriptTag + Marker, string.Empty, StringComparison.Ordinal);
     }
 }

Jellyfin.Plugin.JRay/Web/jray-overlay.js

@@ -1,3 +1,18 @@
+/*
+ * JRay pause overlay: lists the cast of the scene the viewer paused in.
+ *
+ * Presence is scene-scoped. An actor who has turned away, is occluded, or is
+ * off-camera during a reverse shot is still in the scene, so this must not be
+ * presented as "who is visible right now" — that is a different, and weaker,
+ * claim than the data makes.
+ *
+ * Every server-supplied string is written with textContent, never innerHTML.
+ * With the manifest exchange these strings may originate from a third-party
+ * server, and this is the one control that holds even if every other check is
+ * bypassed.
+ *
+ * TRACES: JR-005, JR-020, JR-024 | SR-002, SR-004
+ */
 (function () {
     'use strict';
 
@@ -203,6 +218,22 @@
         overlayEl.style.gap = '12px';
         overlayEl.style.pointerEvents = 'none';
 
+        // "In this scene", not "on screen now". Presence is scene-scoped, so
+        // this list includes people the camera is not currently pointing at —
+        // without the heading a viewer reads a paused frame and concludes the
+        // overlay is wrong whenever someone is off-camera mid-conversation.
+        var heading = document.createElement('div');
+        heading.className = 'jrayOverlayHeading';
+        heading.textContent = 'In this scene';
+        heading.style.width = '100%';
+        heading.style.color = '#fff';
+        heading.style.opacity = '0.75';
+        heading.style.fontSize = '13px';
+        heading.style.textTransform = 'uppercase';
+        heading.style.letterSpacing = '0.08em';
+        heading.style.textShadow = '0 1px 3px rgba(0,0,0,0.9)';
+        overlayEl.appendChild(heading);
+
         actors.forEach(function (actor) {
             var card = document.createElement('div');
             card.className = 'jrayActorCard';

README.md

@@ -1,11 +1,11 @@
 # JRay
 
-A Jellyfin plugin that brings an actor-overlay (think Amazon "X-Ray") feature to your media: pause a movie and JRay shows you which actors are on screen at that exact moment.
+A Jellyfin plugin that brings an actor-overlay (think Amazon "X-Ray") feature to your media: pause a movie and JRay shows you which actors are in the scene you paused in.
 
 JRay reads "truth" files produced offline by the
 [scene-actor-extraction](https://github.com/dtourolle/scene-actor-extraction)
 pipeline (face detection + recognition) and exposes an API to query which actors
-are visible at a given timestamp. A small overlay, injected into the Jellyfin web
+are present in the scene at a given timestamp. A small overlay, injected into the Jellyfin web
 client, displays the result when you pause playback.
 
 ## Status
@@ -25,10 +25,29 @@ https://gitea.tourolle.paris/dtourolle/jRay/raw/branch/master/manifest.json
 
 Then install "JRay" from the plugin catalog and restart Jellyfin.
 
+### Required for the overlay: File Transformation
+
+JRay's pause overlay needs a script tag in the web client's `index.html`.
+Install [File Transformation](https://github.com/IAmParadox27/jellyfin-plugin-file-transformation)
+(repository `https://www.iamparadox.dev/jellyfin/plugins/manifest.json`) **before**
+installing JRay. It rewrites the page as it is served, so the file on disk is
+never touched — that survives server upgrades and coexists with other plugins
+patching the same file.
+
+**There is no fallback.** JRay never edits `index.html` on disk: a patch there
+outlives an uninstall, is silently discarded by a web-client upgrade, and races
+any other plugin touching the file. Without File Transformation the pause
+overlay is simply disabled — every other JRay feature works normally, and the
+plugin's configuration page tells you what is missing and how to install it.
+
+Upgrading from an older JRay that did patch `index.html`? It removes its own
+patch on startup, so there is nothing to clean up by hand. See
+[SPEC.md](SPEC.md) JR-021/JR-022.
+
 ## Features
 
 - **Pause overlay** — pause a movie or episode in the web client and see the
-  actors currently on screen, without leaving the player.
+  actors in the current scene, without leaving the player.
 - **Sidecar truth files** — drop a `Movie.jray.json` next to `Movie.mkv` and JRay
   picks it up automatically (suffix configurable).
 - **Remote truth push** — for servers that can't run the extraction pipeline
@@ -63,12 +82,12 @@ Then install "JRay" from the plugin catalog and restart Jellyfin.
 ```
 
 1. The extraction pipeline analyses a film offline and emits a **truth file**
-   listing each detected actor and the time windows they're on screen.
+   listing each actor and the time windows they are present in the film.
 2. JRay loads that truth file either from a **sidecar** next to the media
    (`Movie.jray.json`) or from a **managed store** populated via the push API.
 3. On startup JRay injects a small `<script>` into the web client's `index.html`.
    When you pause, the script calls JRay for the current item and timestamp and
-   renders the on-screen actors as an overlay.
+   renders the scene's cast as an overlay.
 
 ## Truth File Format
 
@@ -93,8 +112,11 @@ configurable). Schema (`schema_version: 1`, minimal verbosity):
 }
 ```
 
-An actor is considered visible at timestamp `t` (seconds) if any of their
-`scenes` windows satisfies `start <= t <= end`. JRay prefers `jellyfin_id` (a
+An actor is present at timestamp `t` (seconds) if any of their `scenes` windows
+satisfies `start <= t <= end`. **A window is a claim about scene membership, not
+a recognition event** — an actor who has turned away or is off-camera during a
+reverse shot is still present, and two windows mean a genuine departure and
+return rather than a break in detection. JRay prefers `jellyfin_id` (a
 Jellyfin Person GUID) when present, otherwise resolves `imdb_id`/`tmdb_id`
 against the item's People `ProviderIds`.
 
@@ -108,7 +130,7 @@ the `X-Emby-Token: <token>` header or `Authorization: MediaBrowser Token="<token
 
 | Method & Route | Auth | Description |
 | --- | --- | --- |
-| `GET /Items/{itemId}/jray?t={seconds}` | user | "Context at time t" envelope (on-screen actors), or `404`. |
+| `GET /Items/{itemId}/jray?t={seconds}` | user | "Context at time t" envelope (the scene's cast), or `404`. |
 | `GET /Items/{itemId}/Timeline` | user | Full truth file for an item, or `404` if none. |
 | `PUT /Items/{itemId}/Truth` | admin | Push managed truth data (schema v1). `204` on success, `400` on bad schema. |
 | `DELETE /Items/{itemId}/Truth` | admin | Remove managed truth data (idempotent, `204`). Falls back to sidecar. |
@@ -129,12 +151,12 @@ the `X-Emby-Token: <token>` header or `Authorization: MediaBrowser Token="<token
 
 JRay is designed so that *any* Jellyfin client (not just the bundled web overlay)
 can build an actor-overlay feature. The integration is two calls: figure out
-**what is playing and where**, then ask JRay **who is on screen**.
+**what is playing and where**, then ask JRay **who is in the scene**.
 
-### 1. Query on-screen actors: `GET /Items/{itemId}/jray?t={seconds}`
+### 1. Query the scene's cast: `GET /Items/{itemId}/jray?t={seconds}`
 
 Given a Jellyfin item id and a playback position in **seconds**, returns the
-actors visible at that timestamp. This is the only call most clients need.
+the actors in that scene. This is the only call most clients need.
 
 **Request**
 
@@ -158,7 +180,7 @@ X-Emby-Token: <user-or-api-token>
 }
 ```
 
-- `actors` may be an **empty array** when no one is on screen at `t` — that's a
+- `actors` may be an **empty array** when no one is in the scene at `t` — that's a
   `200`, not a `404`.
 - `404 Not Found` means the item has **no truth data at all** (no managed upload
   and no sidecar file). Treat this as "JRay isn't available for this item" and
@@ -174,7 +196,7 @@ X-Emby-Token: <user-or-api-token>
 
 Returns the complete truth file (the [schema above](#truth-file-format)) — every
 actor with all their scene windows. Use this if you'd rather fetch once and
-compute "who's on screen" client-side (e.g. to drive a scrubber-bar heatmap)
+compute "who is in the scene" client-side (e.g. to drive a scrubber-bar heatmap)
 instead of polling `jray?t=` on each pause. `404` if no truth data exists.
 
 ### Reference implementation (web client)
@@ -193,7 +215,7 @@ var s = sessions[0];
 var itemId = s.NowPlayingItem.Id;
 var t = (s.PlayState.PositionTicks || 0) / 10000000; // ticks → seconds
 
-// 2. Ask JRay who is on screen. ApiClient adds the auth token for you.
+// 2. Ask JRay who is in the scene. ApiClient adds the auth token for you.
 var ctx = await ApiClient.ajax({
     url: ApiClient.getUrl('Plugins/JRay/Items/' + itemId + '/jray', { t: t }),
     type: 'GET', dataType: 'json'
@@ -336,7 +358,7 @@ Jellyfin.Plugin.JRay/
    `<script>` tag in the web client's `index.html`, marked with `<!-- jray-overlay -->`
    so it's idempotent. Re-applied whenever configuration changes.
 5. **Overlay Script** (`jray-overlay.js`): listens for the player's pause event,
-   calls `jray?t=`, and renders the on-screen actors.
+   calls `jray?t=`, and renders the scene's cast.
 
 ## Important Notes
 

build.yaml

@@ -19,4 +19,9 @@ dotnet_configuration: "Release"
 dotnet_framework: "net9.0"
 project: "Jellyfin.Plugin.JRay/Jellyfin.Plugin.JRay.csproj"
 changelog: >
-  Initial scaffold
+  The pause overlay is now served through the File Transformation plugin, which
+  rewrites the web client's index.html as it is sent. JRay no longer edits that
+  file on disk and there is no fallback: without File Transformation the overlay
+  is disabled and every other feature works normally. Any stale on-disk patch
+  left by an earlier JRay is removed on startup, and the plugin's configuration
+  page now reports whether the dependency is satisfied.

docs/requirements.md

@@ -0,0 +1,350 @@
+# jRay — requirements register
+
+Stable IDs for every requirement in [`../SPEC.md`](../SPEC.md), which holds the
+prose. This file is the **authoritative list**; the CI gate reads its
+denominators from here (see [`../scripts/vendor/jray-project/SPEC.md`](../scripts/vendor/jray-project/SPEC.md) §6).
+
+**IDs are permanent.** A withdrawn requirement is marked `Withdrawn` and its
+number is never reused — renumbering is what produces orphan TRACES tags. This
+register replaces the earlier section-numbering of `SPEC.md`, which gave the
+plugin no way to be traced to and left it outside the chain entirely.
+
+Tag code with `// TRACES: JR-012 | SR-002`.
+
+| Type | Scope |
+|---|---|
+| `JR` | Everything this plugin does — truth format, API, overlay, exchange client |
+| `UT` / `IT` | Unit / integration tests |
+
+## Tests (UT)
+
+| ID | Asserts | Covers | Status |
+|---|---|---|---|
+| UT-001 | Marked tag **and its trailing newline** removed — no blank line accumulates per upgrade cycle | JR-022 | **Passing** |
+| UT-002 | Marked tag with no trailing newline removed | JR-022 | **Passing** |
+| UT-003 | Document without the marker left byte-identical | JR-022 | **Passing** |
+| UT-004 | Removal is idempotent — startup runs it on every boot forever after | JR-022 | **Passing** |
+| UT-005 | **Another plugin's injection left intact** — it is their file too | JR-022 | **Passing** |
+| UT-006 | An unmarked look-alike script tag is left alone — JRay did not write it | JR-022 | **Passing** |
+| UT-007 | No matching rule resolves to `null` | JR-016 | **Passing** |
+| UT-008 | Item rule beats Series rule | JR-016 | **Passing** |
+| UT-009 | **Prioritised series inside an ignored genre — series wins** | JR-016 | **Passing** |
+| UT-010 | Genre matching is case-insensitive | JR-016 | **Passing** |
+| UT-011 | A Series rule valued `Guid.Empty` does not swallow every movie | JR-016 | **Passing** |
+| UT-012 | `TryRegister` returns `false` when File Transformation is absent | JR-023 | **Passing** |
+| UT-013 | …and **warns** naming the install URL, with no "falling back" claim | JR-023 | **Passing** |
+| UT-014 | Overlay disabled ⇒ `index.html` returned unchanged | JR-023 | **Passing** |
+| UT-015 | Null contents return empty rather than throwing — this callback runs on every page another plugin serves | JR-023 | **Passing** |
+| UT-016 | Both bounds **inclusive** — start, interior and end all present | JR-005 | **Passing** |
+| UT-017 | Just outside either bound is absent | JR-005 | **Passing** |
+| UT-018 | A zero-length window is a real sighting, not a degenerate one to discard | JR-005 | **Passing** |
+| UT-019 | **Overlapping windows** — present inside an enclosing window | JR-005 | **Passing** |
+| UT-020 | **Unsorted windows still resolve**; sortedness is a producer guarantee, not a correctness dependency | JR-006 | **Passing** |
+| UT-021 | **Adjacent windows are never merged** — reported once, from two windows | JR-004 | **Passing** |
+| UT-022 | Truth file round-trips with windows byte-identical | JR-004 | **Passing** |
+| UT-023 | 50 actors × 1000 windows: response bounded by actor count, lookup not quadratic | JR-006 | **Passing** |
+| UT-024 | A fetched claim round-trips: server, tier, **offset**, caveat, timestamp | JR-010 | **Passing** |
+| UT-025 | A local push records no server and **no tier** — there is no cut to match | JR-010 | **Passing** |
+| UT-026 | Provenance is **not** written into the truth file | JR-010, JR-004 | **Passing** |
+| UT-027 | `Delete` removes provenance too — no record outliving its claim | JR-010 | **Passing** |
+| UT-028 | Unknown item yields null rather than a fabricated record | JR-010 | **Passing** |
+
+All execute and pass. The suite is also checked to **fail** on deliberate
+mutations, because a suite that has only ever passed is not evidence that it
+tests anything. Three so far, each restored and re-verified afterwards:
+
+| Mutation | Fails | Blast radius |
+|---|---|---|
+| Drop the newline-stripping in `RemoveInjection` | UT-001 | 1 test |
+| Downgrade the missing-dependency warning to `Information` | UT-013 | 1 test |
+| Make the window end bound exclusive (`t < end`) | UT-016, UT-018 | 2 tests |
+| Stop `Delete` removing provenance | UT-027 | 1 test |
+
+The third is the one worth keeping: a single character turns an inclusive window
+into a half-open one, which would drop an actor at exactly the moment a scene
+ends — and nothing else in the suite would have noticed.
+
+`JR` is flat rather than split by theme. The plugin is one deployable with one
+audience, and the thematic grouping lives in the section headings below, where it
+costs nothing and cannot go stale against a prefix.
+
+Status: `Done` · `In Progress` · `Planned` · `TBD` · `Withdrawn`
+
+---
+
+## Truth-file format (JR-001 … JR-007)
+
+jRay **owns** this format ([system spec](../scripts/vendor/jray-project/SPEC.md) §1); extraction is the
+producer and the public server carries a derived envelope. Changes are
+coordinated `schema_version` bumps (SR-003).
+
+| ID | Requirement | Traces to | Priority | Status |
+|---|---|---|---|---|
+| JR-001 | The truth-file format is normatively defined here; other repos reference it rather than restating it | SR-003 | High | In Progress |
+| JR-002 | `schema_version: 2` shape — `extraction.*` provenance block, `cut.*` block, `scenes` as objects carrying belief and route | SR-003 | High | Planned |
+| JR-003 | Reject an unknown `schema_version`, never guess. **Flag day: v2 only**, no dual-accept | SR-003 | High | Planned |
+| JR-004 | A window is a **scene-membership claim**, not a recognition event — never reinterpreted, merged, split or trimmed | **SR-002** | High | **Done** (UT-021, UT-022) |
+| JR-005 | Query semantics: actor present at `t` if any window contains `t`; presentation must not assert instantaneous visibility | **SR-002** | High | **Done** (UT-016…019) |
+| JR-006 | Read path holds up under **numerous** windows — no assumption of a handful of long ones | SR-002 | Medium | **Done** (UT-020, UT-023) |
+| JR-007 | Identity is public identifiers: prefer `jellyfin_id` locally, else resolve `imdb_id`/`tmdb_id` against the item's People `ProviderIds` | SR-001 | High | Done |
+
+## Truth-data sources and precedence (JR-008 … JR-011)
+
+| ID | Requirement | Traces to | Priority | Status |
+|---|---|---|---|---|
+| JR-008 | Discover a sidecar truth file beside the media, by configurable suffix | PR-001 | High | Done |
+| JR-009 | Accept truth data pushed by a remote worker (`PUT`/`DELETE`), admin key | PR-004 | High | Done |
+| JR-010 | Precedence: managed truth (pushed **or** fetched) overrides a sidecar; provenance is recorded so the UI can distinguish the three sources | PR-001 | High | **Done** (UT-024…028) |
+| JR-011 | Loaded truth is cached; any write invalidates the item's cache entry immediately | PR-001 | Medium | Done |
+
+## Read API (JR-012 … JR-014)
+
+| ID | Requirement | Traces to | Priority | Status |
+|---|---|---|---|---|
+| JR-012 | `GET .../Timeline` returns the full truth file for an item | PR-001 | High | Done |
+| JR-013 | `GET .../jray?t=` returns an **extensible** context envelope; consumers ignore unknown keys | PR-001 | High | Done |
+| JR-014 | Authorisation: reads need an authenticated user, admin routes need the Administrator role, only `ClientScript` is anonymous | PR-004 | High | Done |
+
+## Work discovery, policy and coverage (JR-015 … JR-019)
+
+| ID | Requirement | Traces to | Priority | Status |
+|---|---|---|---|---|
+| JR-015 | `Tasks/Pending` serves a random sample of items with no truth data, so pollers spread across the backlog without server-side task state | PR-003 | High | Done |
+| JR-016 | Prioritise/ignore rules scoped `Genre` / `Series` / `Item`; **most specific wins**; scope+value is the unique key | PR-003 | Medium | **Done** (UT-007…011) |
+| JR-017 | Rules steer **work discovery only** — never the overlay or the read endpoints | PR-003 | Medium | Done |
+| JR-018 | Coverage report by media type and genre; ignored items leave the percent-done denominator rather than dragging it down | PR-003 | Medium | Done |
+| JR-019 | Picker endpoints (genres, series, item search) populate the rule editor | PR-003 | Low | Done |
+
+## Player overlay (JR-020 … JR-024)
+
+| ID | Requirement | Traces to | Priority | Status |
+|---|---|---|---|---|
+| JR-020 | Pause overlay: injected client script queries `jray?t=` and renders the scene's cast | **PR-001** | High | Done |
+| JR-021 | **jRay never injects into `index.html` on disk.** File Transformation is a hard dependency; there is no on-disk fallback. The only permitted write is JR-022's removal | PR-004 | High | **Done** |
+| JR-022 | Migration: remove any on-disk patch left by an earlier jRay, identified by the `<!-- jray-overlay -->` marker | PR-004 | High | **Done** (UT-001…006) |
+| JR-023 | Absent the dependency, disable **only** the overlay and say so in the log and the config page; never bundle the assembly | PR-004 | Medium | **Done** (UT-012…015; config page is T4) |
+| JR-024 | Actor names and all server-supplied strings render as **text, never markup** | SR-004 | High | Done |
+
+## Manifest exchange client (JR-025 … JR-037)
+
+Plugin-side requirements for the exchange specified in
+[`../../JRay-public-server/SPEC.md`](../../JRay-public-server/SPEC.md) §9. The
+wire format is the server's; **the client's obligations are jRay's**, and belong
+in this register rather than in the server's spec.
+
+The server's register already anticipates this: its `UR-007` is recorded as
+having "no server-side test and cannot have one — it is a requirement on the
+plugin", to be cross-referenced from the plugin's register once one exists. This
+is that register, and `JR-025` is that row. `UR-007` should now point here and
+stay `In Progress` until `JR-025` is `Done`.
+
+| ID | Requirement | Traces to | Priority | Status |
+|---|---|---|---|---|
+| JR-025 | Query an **ordered list** of servers; first result clearing the configured tier wins — **satisfies `JRay-public-server` UR-007** | PR-006 | High | Done |
+| JR-026 | For a series, first-match applies per **episode** — later servers are queried only for the episodes earlier ones lacked | PR-006 | Medium | Planned |
+| JR-027 | Treat **every** server as untrusted, including the default: re-validate on receipt against the strict upload schema, bounds-check windows against the item's real runtime | SR-004 | High | Done |
+| JR-028 | Enforce response size caps **while streaming** — 2 MiB single, 25 MiB bundle — aborting rather than buffering | SR-004 | High | Done |
+| JR-029 | HTTPS required for non-loopback servers; certificate validation must not be disabled | SR-004 | High | Done |
+| JR-030 | Apply an `audio`-tier `offset` to **every** window before storing — stored truth is always in the local file's timebase, so read paths need no offset awareness | SR-003 | High | Done |
+| JR-031 | Fetch endpoints: item fetch, series bundle fetch, per-server status, content identify | PR-006 | High | Planned |
+| JR-032 | Identify is **never automatic** — storing a candidate is a separate confirmation step | PR-006 | Medium | Planned |
+| JR-033 | Scheduled sweep over items lacking truth data, using the **batch** `exists` endpoint | PR-006 | Medium | Planned |
+| JR-034 | Contribution strips `movie` and `jellyfin_id`, attaches identity from `ProviderIds` plus measured runtime, and posts **only** to contribute-enabled servers — never fanned out | PR-005 | High | Planned |
+| JR-035 | Uploads set `Expect: 100-continue`, so a rejection lands before a bundle body is transmitted | PR-006 | Low | Planned |
+| JR-036 | Minimum accepted match tier is configurable; a `loose` match surfaces as a caveat rather than being applied silently | PR-006 | Medium | In Progress |
+| JR-037 | A server that is unreachable or failing is skipped on a short timeout with backoff; one dead server never stalls a sweep | PR-006 | Medium | Done |
+
+## Egress and privacy (JR-038 … JR-041)
+
+`PR-005` had **no software row in any repo** — it was held structurally, by
+SR-004 and GR-005 both being prohibitions. jRay is the component that actually
+performs egress, so these are the rows that make it verifiable rather than merely
+preserved.
+
+| ID | Requirement | Traces to | Priority | Status |
+|---|---|---|---|---|
+| JR-038 | Every exchange feature is **opt-in and off by default**, including the pre-configured community server | **PR-005** | High | Done |
+| JR-039 | No library-wide inventory in one request: batch `exists` capped at 100 items, sweeps paced | **PR-005** | High | Planned |
+| JR-040 | The config page states plainly that **each configured server multiplies the exposure** | **PR-005** | Medium | Planned |
+| JR-041 | The plugin never fetches, stores, or transmits gallery data — reference faces or embeddings. It has no gallery code path at all | **SR-005** | High | Done |
+
+## Audio signature (JR-042 … JR-045)
+
+Mirror-image of extraction `IR-004`/`IR-005`/`IR-007`/`IR-008`. Both producers
+must agree **bit-for-bit**, so each obligation is stated on both sides rather
+than assumed to be inherited.
+
+| ID | Requirement | Traces to | Priority | Status |
+|---|---|---|---|---|
+| JR-042 | Compute the signature **exactly** per server spec §3, using the FFmpeg binary Jellyfin already ships via `IMediaEncoder.EncoderPath` — no new dependency | SR-003 | Medium | Planned |
+| JR-043 | Golden-vector fixture **shared with the extraction repo**, proving the two implementations are bit-exact | SR-003 | High | Planned |
+| JR-044 | Media shorter than 120 s: emit no signature and apply no sync offset — identical rule in both producers | SR-003 | Low | Planned |
+| JR-045 | Emit and honour the signature's own `v1:` prefix, so a DSP change is detectable rather than silently non-matching | SR-003 | Low | Planned |
+
+## Human-in-the-loop association (JR-046)
+
+| ID | Requirement | Traces to | Priority | Status |
+|---|---|---|---|---|
+| JR-046 | Review UI for unidentified track clusters: show context crops, pick from the title's cast or search TMDB, record the association | [system §4](../scripts/vendor/jray-project/SPEC.md) | Medium | **TBD** |
+
+Deliberately a single placeholder row rather than a decomposed set. It depends on
+extraction `AR-021`/`AR-022` landing, and on system open question 2 (whether
+unidentified presence is published at all) — decomposing it now would fix an
+interface against an undecided upstream.
+
+**It carries tiers (T2 + T4) despite being undesigned, and stays in the coverage
+denominator.** Tiers say *how* it will be verified, which is knowable — an
+association endpoint is CI-testable, the UI is not — without asserting *what*
+the assertions are, which is not. Recording it as T4-only would have been the
+tempting move, because that drops it out of CI scope and lifts the CI
+percentage; it would also have been the 158%-coverage error in miniature, a
+number improved by reclassifying work rather than by doing it. An unbuilt
+requirement should count against coverage until it is built.
+
+---
+
+## Verification strategy
+
+**CI is an Intel N100** ([system spec](../scripts/vendor/jray-project/SPEC.md) §6). Unlike the extraction
+pipeline this costs jRay almost nothing: the plugin is CPU-only managed code, and
+every requirement above except the live-integration ones is executable in CI.
+
+| Tier | Runs in CI | What it covers |
+|---|---|---|
+| **T1 — Unit** | Yes | Parsing, precedence, policy resolution, coverage arithmetic, offset application, audio DSP, schema rejection |
+| **T2 — Host integration** | Yes | Controllers and authorisation against a test host with a faked `ILibraryManager` |
+| **T4 — Live** | **No** | Real Jellyfin + File Transformation + web client; real manifest server round-trip |
+| **static** | Yes | Grep/analyzer checks — e.g. no injection path into `index.html` (JR-021) |
+
+**T3 is deliberately unused.** Executable tiers are declared per repo in
+[`../traceability.toml`](../traceability.toml), so the numbering is a local
+choice — but jRay keeps **T4** for "no CI host can run this" because that is
+what T4 means in `scene-actor-extraction`. A tier number should mean the same
+thing when read across repos; reusing T3 for a live tier here would make a
+cross-repo reader count live-only requirements as covered.
+
+`Jellyfin.Plugin.JRay.Tests` (xUnit, in the solution) carries the T1 tier. It
+builds clean alongside the plugin and all 15 tests pass.
+
+### Running the suite on a box without the web runtime
+
+`dotnet test` from the repo root. Two properties on the test project make that
+work anywhere, and both are load-bearing rather than incidental:
+
+- **`RollForward=LatestMajor`.** The plugin targets `net9.0` to match Jellyfin's
+  ABI, but a machine that can *build* it need not have the 9.0 runtime. Rolling
+  the test host forward keeps the suite runnable without pinning developers to a
+  runtime the plugin does not otherwise need.
+- **`DisableTransitiveFrameworkReferences=true`.** The plugin
+  framework-references `Microsoft.AspNetCore.App` through `Jellyfin.Controller`,
+  and that flows into anything referencing it — so the test host would otherwise
+  demand a web runtime that no version of exists in the Arch repositories for
+  .NET 9 (8 and 10 only).
+- **Explicit `Jellyfin.Controller` / `Jellyfin.Model` references.** The plugin
+  sets `ExcludeAssets=runtime` on both, because at run time the *server* supplies
+  them and shipping copies would risk loading a second, different
+  `MediaBrowser.Common`. The test host is not the server, so it must bring its
+  own — hence the same packages without that exclusion, and only in the test
+  project.
+
+Those two together are what make it work: the first drops the demand for the web
+*framework*, the second supplies the Jellyfin *assemblies*. Cutting the framework
+reference alone is not enough — `ILogger` and `MediaBrowser.Common` live in the
+excluded assets, so anything beyond genuinely dependency-free logic fails to load
+with `FileNotFoundException` at run time rather than at build.
+
+**T2 — controllers and authorisation — is still a separate matter**, since
+instantiating MVC types needs the ASP.NET Core runtime itself, not just its
+reference assemblies. Those tests belong in a second project that keeps the
+framework reference and leans on `RollForward` to reach the 10.0 runtime.
+
+### Per-requirement verification plan
+
+| ID | Tier | Test asserts | Edge cases to cover |
+|---|---|---|---|
+| JR-001 | static | Other repos' specs link here rather than restating the schema | A second copy of the schema anywhere is the failure |
+| JR-002 | T1 | A v2 file round-trips; `scenes` objects retain belief and route | Window with belief exactly at the ownership threshold; all three route values |
+| JR-003 | **T1** | `schema_version` 1 and 3 are both **rejected**, not coerced | Missing field entirely; non-integer value |
+| JR-004 | T1 | Windows are stored and served byte-identical to input | Adjacent windows that "look" mergeable must **not** merge |
+| JR-005 | T1 | `t` exactly on `start` and on `end` are both present | Zero-length window; overlapping windows for one actor |
+| JR-006 | T1 | Response bounded by actor count, not window count; lookup not quadratic | 50 × 1000 windows; **unsorted input still resolves** — sortedness is a producer guarantee, never a correctness dependency |
+| JR-007 | T1 | `jellyfin_id` preferred; falls back to provider ids | All three ids empty → actor still displayable by name |
+| JR-008 | T1 | Sidecar path derived from the item path plus the configured suffix | Item with no path; suffix changed at runtime |
+| JR-009 | T2 | `PUT` stores, `DELETE` removes, both admin-only | `DELETE` on an item with no managed truth is still `204` |
+| JR-010 | T1 | Managed overrides sidecar; provenance survives a round trip and is deleted with its truth | Fetched vs pushed for the same item; **provenance never inside the truth file**; unknown item yields null |
+| JR-011 | T1 | A write invalidates the cached entry immediately | Read, push, read again within the cache window |
+| JR-012 | T2 | Returns the file, or `404` when no source has data | Sidecar present but unparseable |
+| JR-013 | T2 | Envelope shape is stable; extra keys are additive | Item with truth data but no actor present at `t` |
+| JR-014 | T2 | Anonymous request to each admin route is refused | Authenticated non-admin on an admin route |
+| JR-015 | T2 | Sample excludes covered items and clamps `limit` | `limit` of 0 and of 1000; library of missing-path ghosts |
+| JR-019 | T2 | Pickers return `{value,label}`; empty search returns `[]` | Two episodes named "Pilot" — labels must disambiguate |
+| JR-020 | **T4** | Overlay appears on pause and lists the scene cast | Live web client only |
+| JR-016 | T1 | Item beats Series beats Genre | Prioritised series inside an ignored genre — the case that motivated the rule |
+| JR-017 | **T1** | An ignored item still serves its overlay | Rule added after truth data exists |
+| JR-018 | T1 | `covered / (total - ignored)` | Item carrying two genres counts in both rows |
+| JR-021 | **static** | No code path *adds* the script tag to `index.html` | `scripts/checks/no-index-injection.sh`. Removal (JR-022) is the one permitted write, so the check is on injection, not on writing. Verified to **fail** on a reintroduced `Apply()` and on reintroduced `ReplaceLast` injection, not merely to pass today |
+| JR-022 | T1 | A marked legacy patch is removed; unmarked content untouched | Foreign plugin's injection left intact |
+| JR-023 | T1 + **T4** | Absent dependency disables only the overlay, and the log says so | Detection and log content covered by UT-012…015; the config-page banner is T4, verifiable only against a live server |
+| JR-024 | T1 | A name containing markup renders escaped | `<script>` in an actor name from a hostile server |
+| JR-025 | T1 | First result clearing the tier wins; disabled servers skipped | All servers fail; first server returns a below-tier match |
+| JR-026 | T1 | Server 2 queried only for episodes server 1 lacked | Bundle with a gap in the middle of a season |
+| JR-027 | T1 | Unknown field, oversized body, and out-of-range window each rejected | Window ending beyond the item's runtime |
+| JR-028 | T1 | Stream aborts past the cap rather than buffering | Server declaring a small length and sending more |
+| JR-029 | T1 | Plain `http` to a non-loopback host is refused | `http://localhost` allowed; `http://192.168.x` refused |
+| JR-030 | **T1** | Offset added to every window before storage | Negative offset; offset that would push a window below zero |
+| JR-031 | T2 | All four routes exist and are admin-only | — |
+| JR-032 | T1 | `Identify` returns candidates and stores nothing | A single high-confidence candidate still does not auto-store |
+| JR-033 | T1 | Sweep batches through `exists` and paces | Backlog smaller than one batch |
+| JR-034 | **T1** | `movie` and `jellyfin_id` absent from the upload body | Contribution attempted to a `FetchOnly` server must not send |
+| JR-035 | T1 | `Expect: 100-continue` set on uploads | — |
+| JR-036 | T1 | Below-tier match is not stored; `loose` is flagged | Tier configured to `audio` with only a `runtime` match available; **`MatchTier` has no `Exact` member** — the file-hash tier is withdrawn on legal grounds, so a test naming it would not compile |
+| JR-037 | T1 | Failing server skipped, backoff grows | Every server failing must not hang the sweep |
+| JR-038 | **T1** | Every exchange switch defaults off; community server disabled | Fresh config object, no user input |
+| JR-039 | T1 | Batch never exceeds 100 items | Library of 10⁴ items produces a paced sweep |
+| JR-040 | **T4** | Config page states the per-server exposure | Manual review of copy |
+| JR-041 | **static** | No embedding or image field is parsed or stored | Grep-based, mirroring the server's UR-012 |
+| JR-042 | T1 | DSP chain matches the specified parameters exactly | Window, hop, band, bin count each asserted individually |
+| JR-043 | **T1** | Signature matches the shared golden vector **bit-for-bit** | Media < 120 s → no signature; identical result in both repos |
+| JR-044 | T1 | Media < 120 s yields no signature and no offset | Exactly 120 s — the boundary both repos must agree on |
+| JR-045 | T1 | `v1:` emitted; an unknown prefix is refused, not parsed | `v2:` signature from a future producer |
+| JR-046 | T2 + **T4** | *Assertions deferred* — recording an association and persisting it is T2; the review UI itself is T4 | Cannot be written until the truth-file interface for unidentified presence is settled (system open question 2) and AR-021/AR-022 land |
+
+Three are worth singling out. **JR-021** and **JR-041** are static checks because
+both are requirements to *not do something*, and a prohibition is verified by
+absence, not by a passing test. **JR-043** is the cross-repo check: it is the only
+test in this repo whose fixture is shared with another, and it is CPU-only DSP,
+which is exactly why it can be the binding check rather than an aspiration.
+
+---
+
+## Running the gate
+
+The extractor is shared and vendored, never forked — there must only ever be one
+implementation. Everything that varies per repo lives in
+[`../traceability.toml`](../traceability.toml), so the invocation carries no
+flags to drift out of sync between a developer's shell and CI:
+
+```sh
+python3 scripts/vendor/jray-project/scripts/traceability/extract_traces.py \
+    --root . --format coverage
+```
+
+That config declares the `JR` prefix, the languages, the source roots, the
+CI-executable tiers, and the path to the vendored system spec.
+
+Refresh the pinned tooling with
+`git submodule update --remote scripts/vendor/jray-project`.
+
+Two choices in it are worth knowing about. `scripts/checks` is scanned so the
+**static checks carry their own TRACES tags** — an enforcement script is
+evidence for a requirement exactly as a unit test is. And the source roots are
+listed individually rather than as `scripts`, because the latter would walk
+`scripts/vendor/jray-project` and harvest the `AR-nnn` examples in the
+extractor's own docstrings as orphan tags.
+
+`JR` is now what the shared tooling expects too — its example config names
+`jRay: ["JR"]` — so the prefix is settled across all three repos. It was chosen
+because `JRay-public-server` already ships `UR-001…018` and `DR-001…014`, and a
+second repo reusing those prefixes would make `UR-007` ambiguous across
+registers, which is precisely the ID the server's own register asks this one to
+cross-reference (see JR-025).

manifest.json

@@ -7,6 +7,46 @@
     "owner": "dtourolle",
     "category": "General",
     "versions": [
+      {
+        "version": "0.0.0.0",
+        "changelog": "Latest Build",
+        "targetAbi": "10.9.0.0",
+        "sourceUrl": "https://gitea.tourolle.paris/dtourolle/jRay/releases/download/latest/jray_0.0.0.0.zip",
+        "checksum": "d3419f1867499fbc63fb485fb7c6c143",
+        "timestamp": "2026-07-31T09:37:36Z"
+      },
+      {
+        "version": "0.0.4",
+        "changelog": "Release 0.0.4",
+        "targetAbi": "10.9.0.0",
+        "sourceUrl": "https://gitea.tourolle.paris/dtourolle/jRay/releases/download/v0.0.4/jray_0.0.4.0.zip",
+        "checksum": "cb9613660b3fe3b730f46c9c7f257333",
+        "timestamp": "2026-07-04T19:47:05Z"
+      },
+      {
+        "version": "0.0.0.0",
+        "changelog": "Latest Build",
+        "targetAbi": "10.9.0.0",
+        "sourceUrl": "https://gitea.tourolle.paris/dtourolle/jRay/releases/download/latest/jray_0.0.0.0.zip",
+        "checksum": "a76316397228c9d8b8e38fbccad50390",
+        "timestamp": "2026-07-04T19:44:35Z"
+      },
+      {
+        "version": "0.0.3",
+        "changelog": "Release 0.0.3",
+        "targetAbi": "10.9.0.0",
+        "sourceUrl": "https://gitea.tourolle.paris/dtourolle/jRay/releases/download/v0.0.3/jray_0.0.3.0.zip",
+        "checksum": "da5ded2ee720f7a7f7e15ac092871a91",
+        "timestamp": "2026-07-04T19:11:39Z"
+      },
+      {
+        "version": "0.0.0.0",
+        "changelog": "Latest Build",
+        "targetAbi": "10.9.0.0",
+        "sourceUrl": "https://gitea.tourolle.paris/dtourolle/jRay/releases/download/latest/jray_0.0.0.0.zip",
+        "checksum": "0d1cc8954a1b0557eb5ec6c368bce486",
+        "timestamp": "2026-07-04T19:10:48Z"
+      },
       {
         "version": "0.0.2",
         "changelog": "Release 0.0.2",

scripts/checks/no-index-injection.sh

@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+# JR-021 — jRay never injects into index.html on disk.
+#
+# This is a requirement to *not do* something, so it is verified by absence.
+# A unit test cannot show that no code path writes the tag; a grep can.
+#
+# The prohibition is on injection, not on writing: JR-022's migration must write
+# to index.html in order to remove a legacy patch. So the check is for code that
+# *adds* the script tag, not for File.Write* generally.
+#
+# TRACES: JR-021 | PR-004
+set -euo pipefail
+
+cd "$(dirname "$0")/../.."
+src="Jellyfin.Plugin.JRay"
+status=0
+
+# The injection is "script tag + marker" written back to the file. The removal
+# path also names both, so match on the concatenation that builds a patched
+# document rather than on the constants themselves.
+if grep -rn --include='*.cs' -E '(ScriptTag|Injected)[[:space:]]*\+.*BodyClose|ReplaceLast|"</body>"[[:space:]]*,' "$src" \
+        | grep -v 'FileTransformationRegistration.cs'; then
+    echo "FAIL (JR-021): index.html injection logic found outside the File Transformation callback." >&2
+    status=1
+fi
+
+# WebClientPatchService is removal-only. Any write there must be the cleaned
+# document; a write of a *patched* one is the regression this guards.
+if grep -n -E 'WriteAllText\((?!.*cleaned)' -P "$src/Services/WebClientPatchService.cs" >/dev/null 2>&1; then
+    echo "FAIL (JR-021): WebClientPatchService writes something other than the cleaned document." >&2
+    status=1
+fi
+
+# The disk-patching entry point must not come back.
+if grep -rn --include='*.cs' -E '\bWebClientPatchService\.Apply\b' "$src"; then
+    echo "FAIL (JR-021): the injecting Apply() entry point has been reintroduced." >&2
+    status=1
+fi
+
+if [ "$status" -eq 0 ]; then
+    echo "OK (JR-021): no on-disk injection path."
+fi
+
+exit "$status"

traceability.toml

@@ -0,0 +1,31 @@
+# traceability.toml — per-repo configuration for the shared trace extractor.
+# The extractor itself is vendored at scripts/vendor/jray-project.
+
+# Flat, rather than split by theme as scene-actor-extraction is. The plugin is
+# one deployable with one audience, and JRay-public-server already ships UR/DR
+# — a second repo using those prefixes would make UR-007 ambiguous across
+# registers, and UR-007 is precisely the ID the server asks this register to
+# cross-reference (see JR-025).
+requirement_types = ["JR"]
+
+languages = ["csharp", "javascript"]
+
+# The static checks carry TRACES tags of their own. An enforcement script is
+# evidence for a requirement exactly as a unit test is — JR-021 is a
+# prohibition, and a prohibition can only be verified by absence.
+source_suffixes = [".sh"]
+
+# Explicit roots rather than "scripts", which would walk scripts/vendor and
+# harvest the AR-nnn examples in the extractor's own docstrings as orphan tags.
+source_roots = [
+    "Jellyfin.Plugin.JRay",
+    "Jellyfin.Plugin.JRay.Tests",
+    "scripts/checks",
+]
+
+# jRay has two CI tiers and one live tier. T3 is deliberately unused: T4 keeps
+# the meaning it has in scene-actor-extraction — "no CI host can run this" —
+# so a tier number means the same thing when read across repos.
+ci_executable_tiers = ["T1", "T2", "static"]
+
+system_spec = "scripts/vendor/jray-project/SPEC.md"