docs: fold shipped specs into the architecture docs and delete them

A spec was a promise; sixteen of them had become descriptions of code that
already shipped, sitting beside four that describe work still outstanding, with
nothing in the file telling the two apart. Half the statuses were also wrong —
audio-equalizer read "Accepted" with the EQ live on both platforms, the native
video spec said the flag stays off after the default was flipped on.

The shipped designs move into docs/architecture, which is the maintained
description of the build, and the spec files go. Git history keeps the
originals; what a future change still needs is carried across:

- 01-rust-backend: favourites rewritten (the old section named a file that no
  longer exists and called shipped buttons "planned"), domain vocabulary owned
  by Rust (SearchScope, exclusions, the bitrate ladder), background workers
- 02-svelte-frontend: app shell and chrome, library mosaic, series/episode
  navigation, downloaded browse, safe-area insets, native-video store, logging
- 03-data-flow: locally-indexed search
- 05-platform-backends: audio settings on ExoPlayer, the equalizer's band
  vocabulary, native video compositing, the background-audio handoff
- 06-downloads-and-offline: one storage model, offline catalog visibility
- 09-security: path confinement and input binding

docs/specs/README.md now says what the directory is for and where each shipped
design went. Deferred work the specs recorded is kept beside the code it
concerns rather than lost: season-bounded autoplay, the two dead search
commands, why indexing is a full crawl.

requirements.md had fourteen stale statuses — Android audio parity still read
"Linux only", DR-150 still said the native-video default was off, DR-190 was
Proposed after DR-196 implemented it, and five tooling requirements were
Proposed after landing. Three unbuilt specs suggested requirement ids that have
since been allocated to other work; each now carries a warning.
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# Specs index
Feature specs for JellyTau. Start a new one from
[SPEC-TEMPLATE.md](SPEC-TEMPLATE.md) and run it past
[SPEC-REVIEW-CHECKLIST.md](SPEC-REVIEW-CHECKLIST.md) before accepting it.
## What lives here
**Only work that has not shipped.** Once a spec is fully implemented its design
is folded into the architecture docs — which are the maintained description of
the build — and the spec file is deleted. Git history keeps the original,
including its rejected alternatives and acceptance criteria; the architecture
docs keep the reasoning that a future change still needs.
So: a file in this directory is a **promise, not a description**. If you want to
know how something *works*, read
[docs/architecture/](../architecture/README.md). If you want to know what is
*planned*, read here.
**Status vocabulary**
| Status | Meaning |
|---|---|
| Proposed | Written, not accepted. Nothing built. |
| Accepted | Agreed as the design; implementation not started or not finished. |
| Partially implemented | Some parts shipped; the spec names what is left. |
| Design authority | No code of its own — it records a decision later specs act on. |
**Next free requirement ids** (always re-check
[requirements.md](../requirements.md) before allocating): **UR-077**,
**IR-033**, **DR-215**. Three specs below suggested ids that have since been
taken by other work; each carries a ⚠️ note at the top.
## Partially implemented
| Spec | What landed | What is left |
|---|---|---|
| [frontend-domain-model.md](frontend-domain-model.md) | Catalog surface: `MediaKind`, `from_jellyfin` isolated, ticks → ms | `primaryImageTag``imageId` (~30 sites); player/session/reporting tick math; `stream.type` |
| [libmpv2-migration.md](libmpv2-migration.md) | `LICENSE` | The `libmpv``libmpv2` crate swap |
| [read-through-media-cache.md](read-through-media-cache.md) | DR-126…128, DR-133…138 — cache entries *are* download rows; local playback of downloads | DR-121/122/124/125 — the player quality selector and the read-through capture |
| [scoped-search-boundary-implementation.md](scoped-search-boundary-implementation.md) | Stage 1: `SearchScope` owned by Rust (DR-063…067) | Stage 2: result-side grouping (`GROUP_ITEM_TYPES` still in `searchScope.ts`) |
## Not started
| Spec | Blocked on / note |
|---|---|
| [build-provenance.md](build-provenance.md) | `build.rs` is still bare. ⚠️ suggested id DR-093 is taken. |
| [player-facade-enforcement.md](player-facade-enforcement.md) | ~60 `commands.player*` sites still outside the facade; no lint rule. ⚠️ suggested id DR-095 is taken. |
| [windows-native-audio-backend.md](windows-native-audio-backend.md) | Blocked on the libmpv2 swap. ⚠️ suggested id IR-030 is taken. |
## Design authority
| Spec | Role |
|---|---|
| [playback-backend-unification.md](playback-backend-unification.md) | Why video cannot unify onto one native engine and audio can. The audio half has since shipped on Android; Windows has not. |
| [scoped-search-boundary.md](scoped-search-boundary.md) | The boundary design the `check:boundary` rule came from. Stage 1 built. |
| [scoped-search.md](scoped-search.md) | Superseded in part — its "frontend only, no Rust changes" decision is the leak the boundary spec reversed. UX still current. |
## Where the shipped specs went
Sixteen specs were folded into the architecture docs and deleted (2026-08-21).
Where to look for each:
| Shipped work | Now documented in |
|---|---|
| Account menu & global chrome | [02-svelte-frontend.md](../architecture/02-svelte-frontend.md) — App Shell and Chrome |
| Library mosaic | [02-svelte-frontend.md](../architecture/02-svelte-frontend.md) — Library Mosaic |
| Series current-episode navigation | [02-svelte-frontend.md](../architecture/02-svelte-frontend.md) — Series and Episode Navigation |
| Downloads as an offline library | [02-svelte-frontend.md](../architecture/02-svelte-frontend.md) — Downloaded Browse |
| Favourites browsing | [01-rust-backend.md](../architecture/01-rust-backend.md) — Favorites System |
| Streaming bitrate cap | [01-rust-backend.md](../architecture/01-rust-backend.md) — Streaming quality ladder |
| Locally-indexed search | [03-data-flow.md](../architecture/03-data-flow.md) — Search Flow; [01-rust-backend.md](../architecture/01-rust-backend.md) — Background workers |
| Offline downloaded-only filter | [06-downloads-and-offline.md](../architecture/06-downloads-and-offline.md) — Offline Catalog Visibility |
| Audio equalizer · Android audio settings parity | [05-platform-backends.md](../architecture/05-platform-backends.md) — Audio settings on ExoPlayer |
| Android native video spike | [05-platform-backends.md](../architecture/05-platform-backends.md) — Native Video Compositing |
| Video background audio | [05-platform-backends.md](../architecture/05-platform-backends.md) — Background Audio Handoff |
| Traceability gate repair | [traceability-ci.md](../traceability-ci.md) |
| Boundary tripwire hardening | `scripts/check-frontend-boundary.sh` (its header is the spec) |
| Playback docs corrections · req-coverage script removal | Nothing to document — both were corrections that have been applied |