3bf9229ae4
Three fixes for the bot going silent after ~10 messages:
1. STT artifact handler now returns early — previously detected noise
leaks ("Vielen Dank.", etc.) but still appended them to transcript,
inflating context until LLM timed out after 4 retries.
2. Context truncation — caps LLM chat context at 40 items and internal
transcript at 80 entries to prevent unbounded growth in long sessions.
3. LLM timeout recovery — watchdog detects when agent has been silent
for >60s despite user activity, sends a recovery reply asking user
to repeat their question instead of staying permanently silent.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>