Pace the software decode fixture by decoder admission

[zortos293]

What changed

The software-decode fixture now waits for each access unit to reach the decoder before submitting the next one, draining output while it waits. The wait uses existing submission diagnostics and has a five-second deadline. Admission must return Queued; dropped input is no longer tolerated by a test that requires contiguous output.

No production code, queue capacities, decoder settings, or frame-continuity assertions changed.

Why

The old fixture submitted a 30 FPS bitstream with an unconditional 1 ms delay. Under scheduler pressure it could overflow bounded queues and then fail its frame-count or timestamp assertions. A controlled burst reproduced an explicit video queue-overflow event. The original also failed all 12 worker stress runs under four CPU spinners; the paced version passed the same workload.

Verification

• Independent parent replay: 777 bundled-native tests passed, 16 ignored; strict workspace Clippy and formatting passed with linux-ffmpeg-bundled.
• Independent parent stress replay: 8/8 passes under four CPU spinners.
• Worker stress coverage: 67/67 fixed runs passed across idle, 4-, 8-, and 16-spinner workloads, plus 6/6 after comment cleanup.
• Existing frame-count, timestamp continuity, dimensions, NV12/SDR CPU-plane, second-keyframe, and look-ahead assertions remain intact.

This is a separate acceptance-fixture correction discovered during final Sony validation, not a Sony production change.

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