feat: production hardening — relay v1.0.0, receiver protocol completeness
Relay v1.0.0:
- Max receivers per channel (default: 64) with rejection counting
- Max channels limit (default: 256) with over-limit rejection
- Channel GC: periodic scan removes idle channels after grace period (30s)
- Source reconnection: cache preserved on disconnect, new input channels
- Stats: peak_receivers, total_connections, rejected_connections, uptime
- ChannelState::is_idle(), grace_period_expired() for lifecycle mgmt
- StateCache::clear(), has_state() for cache introspection
- Banner shows config: max receivers, max channels, grace period
- 54 tests (+8 new: channel_max_limit, idle detection, grace period, cache ops)
Receiver (_connectStream):
- Complete frame type handling: SignalSync (full replace), SignalDiff (merge),
Pixels/Keyframe (emit stream_frame), DeltaPixels (XOR + RLE decode),
Ping (keepalive), StreamEnd (emit stream_end)
- RLE decoder for delta pixel frames
- Exponential backoff reconnect (1s → capped at 10s)
- Connection stats: frames, bytes, reconnects
- Event emissions: stream_frame, stream_end for app-level handling
105 tests, 0 failures across workspace
cde84ae270