feat: add subtitle generation and bundle Bun launcher runtime

- Add local subtitle generation and card timing review workflows
- Package cross-platform Bun runtimes, launchers, licenses, and source
- Consolidate release packaging and refresh v0.19.6 documentation

docs/architecture/domains.md

@@ -27,6 +27,8 @@ Read when: you need to find the owner module for a behavior or test surface
   Includes stats storage/query schema such as `imm_videos`, `imm_media_art`, and `imm_youtube_videos` for per-video and YouTube-specific library metadata.
   Library-entry identity aliases and merge recommendations are persisted alongside this schema; the stats HTTP and SPA layers only expose and present those domain decisions.
   `delete-maintenance-scheduler.ts` coalesces and serializes stats deletes; the expensive work runs in `delete-maintenance-worker-thread.ts` while the tracker queues playback writes. Each batch uses one transaction, lexical update, rollup refresh, and incremental lifetime subtraction (`planLifetimeRemovals`/`applyLifetimeRemovals` in `lifetime.ts`). Merges, moves, AniList reassignments, and `stats cleanup -l` use `repairLifetimeSummariesFromMedia` (recompute from the per-video media ledger). The full lifetime rebuild survives only as the empty-table bootstrap; anywhere else it would collapse lifetime totals to the session retention window.
+- Immersion sync: `src/core/services/stats-sync/`, bound by `src/main/sync-cli.ts`.
+  `snapshot-transfer.ts` selects compressed rsync or scp. `transfer-cache.ts` atomically retains the last successfully received snapshot per hashed peer/database identity under the config directory's `sync-transfer-cache/`. Cache copies seed isolated transfer directories; rsync verifies reconstructed files before the existing merge engine runs. The `--make-temp` / `--remove-temp` helpers accept an internal `--transfer-cache` key, with a fallback for older peers that do not recognize it.
 - AniList tracking + character dictionary: `src/core/services/anilist/`, `src/main/runtime/composers/anilist-*`, `src/main/character-dictionary-runtime.ts`, `src/main/character-dictionary-runtime/`
 - Jellyfin integration: `src/core/services/jellyfin*.ts`, `src/main/runtime/composers/jellyfin-*`
 - Anime browser: extension bridge client, sidecar, and stream handling in `src/anime-bridge/`;
@@ -47,6 +49,25 @@ Read when: you need to find the owner module for a behavior or test surface
 
 ## Shared Contract Entry Points
 
+Automatic mpv keyboard discovery uses the `get-mpv-input-bindings` IPC request and
+`MpvInputBindingsSnapshot` in `src/types/session-bindings.ts`.
+`src/main/runtime/mpv-input-bindings.ts` queries the connected player and preserves
+configured keys, including disabled entries. `src/shared/mpv-input-bindings.ts`
+validates discovered keys and translates browser input. The renderer's
+`handlers/mpv-input-forwarding.ts` keeps the session lookup, coalesces asynchronous
+refreshes, and releases held keys on blur or disposal. `handlers/keyboard.ts` runs
+this fallback after SubMiner controls and refreshes on startup, a delayed startup
+pass, focus, and binding reload. Discovery does not enter compiled session bindings,
+the plugin artifact, persistent config, or session help.
+
+The subtitle sidebar consumes parsed cues through `SubtitleSidebarSnapshot`. Its `sourceKey`
+identifies the media and subtitle source so renderer selections are invalidated on source changes,
+including changes whose cue text and timings are identical. Native selection and clean clipboard
+serialization live in `src/renderer/modals/subtitle-sidebar-selection.ts`. Electron lets standard
+Copy input reach the renderer, where sidebar selection takes priority over the live-subtitle binding.
+The preload bridge writes selections through Electron's clipboard API so copying does not depend
+on Chromium document focus or require activating the overlay window.
+
 - Config + app-state contracts: `src/types/config.ts`
 - Subtitle/token/media annotation contracts: `src/types/subtitle.ts`
 - Runtime/window/controller/Electron bridge contracts: `src/types/runtime.ts`