refactor(audio): [PKG-AUDIO-04] migrate strict source and compatible type entries

packages/artplayer-plugin-audio-track/README.md

@@ -4,7 +4,40 @@ audio-track plugin for ArtPlayer
 
 ## Demo
 
-[https://artplayer.org](https://artplayer.org/?libs=./uncompiled/artplayer-plugin-audio-track/index.js&example=audio-track)
+[https://artplayer.org](https://artplayer.org/?libs=./uncompiled/artplayer-plugin-audio-track/index.js&example=audio.track)
+
+## TypeScript
+
+The default import and `/legacy` preserve existing TypeScript behavior, including the
+historical required `url` in the `update` parameter type. JavaScript still supports updating
+only selected fields. Use `/runtime` for precise partial-update types; it loads the same
+implementation and adds no runtime dependency:
+
+```ts
+import Artplayer from 'artplayer'
+import audioTrack from 'artplayer-plugin-audio-track/runtime'
+
+const installTrack = audioTrack({ url: '/assets/sample/sprite-fight.aac' })
+const art = new Artplayer({
+  container: '.artplayer-app',
+  url: '/assets/sample/sprite-fight.mp4',
+  plugins: [(art) => {
+    const track = installTrack(art)
+    track.update({ offset: 0.25 })
+    return track
+  }],
+})
+```
+
+Named types include `Option`, `UpdateOption`, `Result` (legacy), `RuntimeResult`, and
+`RuntimeFactory`. `update` returns `void`; `audio` remains the same `HTMLAudioElement`.
+For global scripts in the online editor, explicitly opt into the same precise typing with
+`artplayerPluginAudioTrack as artplayerPluginAudioTrack.RuntimeFactory`.
+
+The plugin follows the main video's playback, volume and rate, but does not automatically
+mute the main video. Destroying ArtPlayer releases the plugin's audio and subscriptions;
+retained plugin updates become inert. See [ARCHITECTURE.md](ARCHITECTURE.md) for module
+ownership, compatibility decisions and regression commands.
 
 ## License