Replace the single-owner PCM queues with one shared LGMP SPMC stream.
Give each admitted client reliable state and an independent playback
cursor, while clients without clock authority resample locally.
Extend the audio protocol with per-client epochs and barriers.
Keep capture exclusive and bound authority backpressure so slow
secondary readers cannot affect the disciplined low-latency path.
Queue playback STOP, START, and DATA for the same wire generation.
Verify that the client creates a fresh local generation and delivers the
first restarted packet.
Treat the binding phase as the authoritative shutdown state after
graceful stream release.
Cover disconnect while the host drains and unbinds both streams.
Scope the legacy latency offset to classic SPICE and use the LGMP
poll bound as its fixed arrival reserve. Keep learned jitter additive.
Select provider clock feedback only when the current remote endpoint
advertises it, avoiding a failed startup attempt on broker v1.
