feat(truth): schema_version 2 read path, v2 only

Replaces the v1 shape rather than accepting both. `anneal_sec` and the
top-level `sample_fps` are deleted, not zeroed; `extraction` and `cut`
blocks arrive; `scenes` become objects carrying belief and route, so a
window records how far to trust it instead of being a bare float pair.

`TruthSchema.IsSupported` is the single gate and is applied on all four
read paths — sidecar, managed store load, managed PUT, and converted
manifest. Previously only the controller checked, so the version the
plugin claimed to require and the one it would actually parse were free
to drift. Rejections name the file and the version found, so an item that
looks empty is distinguishable from one that was refused.

`ManifestConverter` carries belief, route and both provenance blocks
through: dropping them would silently downgrade every fetched manifest
against a locally extracted one.

TRACES: JR-002, JR-003 | SR-003

Jellyfin.Plugin.JRay.Tests/PresenceLookupTests.cs

@@ -25,7 +25,7 @@ public class PresenceLookupTests
         var actor = new TruthActor { Name = "Steve Buscemi", TmdbId = "884" };
         foreach (var w in windows)
         {
-            actor.Scenes.Add(w);
+            actor.Scenes.Add(new TruthScene { Start = w[0], End = w[1] });
         }
 
         return actor;
@@ -102,18 +102,22 @@ public class PresenceLookupTests
         // 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,
+        {"schema_version":2,"movie":"/m.mkv",
+         "extraction":{"sample_fps":1,"extinction_sec":12},
+         "cut":{"runtime_sec":6420.5},
          "actors":[{"name":"A","imdb_id":"","tmdb_id":"884","jellyfin_id":"",
-                    "scenes":[[0.0,10.0],[10.0,20.0],[30.0,30.0]]}]}
+                    "scenes":[{"start":0.0,"end":10.0},
+                              {"start":10.0,"end":20.0},
+                              {"start":30.0,"end":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]);
+        Assert.Equal((0.0, 10.0), (windows[0].Start, windows[0].End));
+        Assert.Equal((10.0, 20.0), (windows[1].Start, windows[1].End));
+        Assert.Equal((30.0, 30.0), (windows[2].Start, windows[2].End));
     }
 
     // UT-023
@@ -129,7 +133,7 @@ public class PresenceLookupTests
             var actor = Actor();
             for (var w = 0; w < 1000; w++)
             {
-                actor.Scenes.Add([w * 10.0, (w * 10.0) + 4.0]);
+                actor.Scenes.Add(new TruthScene { Start = w * 10.0, End = (w * 10.0) + 4.0 });
             }
 
             truth.Actors.Add(actor);