4d54b6f9e4
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Two root-caused bugs documented with full evidence:
1. Send task fatal exit on QUIC congestion (FIXED in 2092245)
- send_media() Err(Blocked) caused break → killed entire call
- Now drops packet and continues
2. Playout ring buffer cursor desync (ROOT-CAUSED, fix pending)
- AudioRing::write() mutates read_pos from producer thread on overflow
- Violates SPSC contract → reader/writer fight over read_pos
- Causes 12-16s bidirectional silence ~25-30s into call
- Both clients affected simultaneously
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>