- Preserve and replay subscription ref counts across address space rebuilds to prevent MXAccess subscription leaks - Mark read timeouts and write failures as unsuccessful in PerformanceMetrics for accurate health reporting - Add deferred MxAccess reconnect path when initial connection fails at startup - Update code review document with verified completions and new findings - Add covering tests for all fixes Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>