Track the LGMP serial for each accepted frame-schedule message and wait
for its acknowledgement before sending another. Preserve pending RESET,
IMMEDIATE, and feedback state after definite enqueue failures.
Use bounded retry polling and request one fresh immediate frame after an
ambiguous pointer-queue fault recovers.
Renew frame scheduling only while the source is active and OBS is
delivering video ticks. Release ownership after deactivation or a stale
tick stream.
Reacquire with a new generation and an immediate frame when ticking
resumes.
Bump KVMFR to version 28 and attach generation, epoch, and deadline
identities to cadence deliveries and their timing records.
Accept phase corrections only for the exact completed publication. Keep
VM and client clocks independent by exchanging relative phase errors.
Make submission, completion, and work-estimate accounting best effort
so scheduler state cannot delay GPU submission or frame publication.
