- Change ConnectedClients metrics from Set() to Inc()/Dec() pattern
for cleaner, atomic metric updates in register/unregister/broadcast
- Add room info to unregister and broadcast-cleanup log messages
- Handle unregistered connections gracefully (close without panic)
- Capture count inside lock for accurate log output
Tests added:
- TestRegisterClient: verifies ClientCount/RoomCount after connect
- TestUnregisterClient: verifies cleanup after disconnect
- TestRegisterMultipleRooms: verifies multi-room state tracking
- TestUnregisterCleansUpEmptyRoom: verifies empty room deletion
- TestUnregisterUnknownConnNoPanic: verifies no panic on unknown conn
All tests pass including race detector.
🤖 Assisted by the code-assist SOP
8eaba398dc