docs: audit and refresh user-facing and internal docs

Cross-check every config key, shortcut, default, and command against the
current source and fix the drift (mpv.socketPath, auto_start_overlay
default, AniSkip TAB key, JLPT N4 color, secondary-sub font/defaults,
secondary-sub language behavior, modular mpv plugin layout, and more).
Add plain-language intros and first-use definitions across onboarding and
integration pages so non-technical readers can follow along.

Internal docs/: fix stale module paths in architecture/domains.md, add
missing contract entry points and catalog rows, and bump verified dates.
Remove the obsolete docs/plans/ directory (its only plan shipped in
0.15.0) and reframe planning.md so plans live with the work, not in docs/.
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# WebSocket / Texthooker API & Integration
**Who this page is for:** developers and tinkerers who want to consume SubMiner's live subtitle stream from their own tools — a browser tab, an automation script, or another mpv plugin. If you just want subtitles in a browser tab for Yomitan, skip to [Texthooker Integration Guide](#texthooker-integration-guide); the rest is reference for building custom clients.
A *texthooker* is a page/tool that receives the text currently on screen so a dictionary extension (like Yomitan) can look words up. SubMiner ships its own texthooker UI and also broadcasts subtitle text over local WebSockets that any client can connect to.
SubMiner exposes a small set of local integration surfaces for browser tools, automation helpers, and mpv-driven workflows:
- **Subtitle WebSocket** at `ws://127.0.0.1:6677` by default for plain subtitle pushes.
@@ -46,7 +50,7 @@ SubMiner's integration ports are configured in `config.jsonc`.
- `texthooker.launchAtStartup` starts the local HTTP UI automatically.
- `texthooker.openBrowser` controls whether SubMiner opens the texthooker page in your browser when it starts.
If you use the [mpv plugin](/mpv-plugin), it can also start a texthooker-only helper process and override the texthooker port in `subminer.conf`.
If you use the [mpv plugin](/mpv-plugin), it can also start a texthooker-only helper process. The launcher derives the plugin's texthooker setting from your SubMiner config (`texthooker.launchAtStartup`) and injects it at runtime — there is no plugin config file to edit.
## Developer API Documentation