Rust-based QConnect renderer with: - QConnect WebSocket protocol (hand-rolled protobuf) - Audio playback via Symphonia + cpal - Play, pause, resume, volume, skip support - Correct BufferState/PlayingState enum values per proto spec - Server-driven queue management (no local queue) - Periodic position reporting for track-end detection Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>