Jobs finished during a crash window are unrecoverable #284

Location: registry.py:140
Severity: MED

_recover_done_job requires metadata.json, which is written after status flips to done. A crash between those two steps leaves a complete stems dir that restore() refuses to recover.
Recover with a placeholder title when stems exist but metadata is missing (title from job dir mtime + “Recovered track”).

From the health report. Part of #273 (Phase 2 — Resilience).