fix(relay): debug tap signal logging, dual_path test regression, PRD updates
- Add log_signal() and log_event() to DebugTap for RoomUpdate,
QualityDirective, join/leave lifecycle events (task #11)
- Fix dual_path.rs Phase 7 regression: add missing ipv6_endpoint arg
to 3 race() call sites
- Update PRDs to reflect actual implementation status: mark adaptive
quality, coordinated codec, P2P, network awareness, protocol analyzer
- Update PROGRESS.md with QualityDirective gap and dual_path regression
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
ea5fc17c34