Add weighted CRF scheduling

[mjc]

Stack 11 of 13. Depends on 09-worker-durability-acknowledgements.

This adds a weighted worker mode that runs a configured number of CRF searches per encode while remaining serial, with queue fallback when the preferred job type is unavailable.

Operators can bias a worker toward search throughput without enabling multiplexed concurrency. The scheduler state survives connection replacement so reconnects do not reset the ratio.

Tests added in this branch cover CLI mode/ratio validation, announcement metadata, exact N-to-one job selection, encode fallback when the CRF queue is empty, serial active-job enforcement, waiting for completion, state preservation across reconnect, and separation from the existing both capacity policy.

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