When a grabbed release fails (transfer error / peer-cancel / never lands), the engine
now retries instead of giving up — the music-style depth:
- Grab stores the OTHER accepted results as a retry pool + the search context (schema
v16: candidates / search_ctx / tried_queries / tried_files / attempts).
- core/video/retry.py (pure, tested): plan_retry() → try the next-best candidate; when
the pool is dry, next_query() generates an ALTERNATE query (movie: drop the year; TV:
numbering variants) to re-search; budget MAX_ATTEMPTS=6. merge_candidates dedupes
against already-tried releases.
- Monitor: on failure, _fail_or_retry hops to the next candidate inline; if none, flips
the row to a new 'searching' state and a background requery thread re-searches the
alternate query, evaluates against the profile, and starts the best fresh hit — or
marks failed once truly exhausted. 'searching' rows are owned by their thread.
- Page: 'Searching' status (Trying another release…) + a 'Nx' attempt badge.
16 tests (retry engine + candidate-retry transition); ruff clean on touched files.
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