Add long-lived worker sessions and typed protocol

[mjc]

Stack 4 of 13. Depends on 02-cli-domain-hardening.

This introduces the long-lived WebSocket worker loop, reconnect backoff, typed Phoenix protocol messages, job assignment and result flow, protocol rejection handling, tracing, and an isolated worker-job execution path.

A worker can now join, announce capabilities, pull work repeatedly, recover connections, run CRF searches, and publish structured results without weakening the existing CLI and ffmpeg argument contracts.

Tests added in this branch run a WebSocket harness through join, announce, no-work polling, assignment, cancellation, disconnect/reconnect, protocol mismatch, and CRF completion. Protocol tests cover current and future payload shapes, structured results and failures, heartbeat metadata, isolated job paths, transfer framing validation, corrupt/duplicate/out-of-order chunks, size limits, resume behavior, and refusal to overwrite destinations.

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