Make multiplexed jobs independently controllable

[mjc]

Stack 9 of 13. Depends on 07-multiplexed-encode.

This gives multiplexed jobs independent process scopes and control state, preserves active outputs during CRF cleanup, fans worker-wide controls out to jobs, replays active jobs after reconnect, supports concurrency overrides, and retains encode jobs until completion acknowledgement.

Controls can now target one job or the whole worker without signaling unrelated processes. Finished outputs and local inputs remain owned until the coordinator has acknowledged the terminal event.

Tests added in this branch prove scoped process groups isolate pause/stop signals, targeted and unscoped controls select the intended jobs, active control state and jobs replay after reconnect, output/input cleanup waits for success and acknowledgement, heartbeats continue without ffmpeg timestamps, transfer ETA handles zero/nonzero rates, concurrency overrides capacity, and pull errors request reconnect.

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