test(asr): [PKG-ASR-01] freeze published interfaces and source contracts

packages/artplayer-plugin-asr/README.md

@@ -1,6 +1,12 @@
 # artplayer-plugin-asr
 
-Ads plugin for ArtPlayer
+Audio capture and subtitle display plugin for ArtPlayer. Supplies PCM/WAV chunks
+to a caller-provided recognition service.
+
+## Maintenance
+
+See [ARCHITECTURE.md](ARCHITECTURE.md) for the current audio flow, public behavior,
+known migration gaps and test commands.
 
 ## Demo