Missed worker from the PR5 discovery-workers series — Tidal sits in the
same domain as the deezer / spotify_public / listenbrainz / youtube /
beatport workers that were lifted in PR5b–PR5h, follows the same shape,
shares the same `_search_spotify_for_tidal_track` helper, and was simply
overlooked in the original inventory.
Pure 1:1 lift of the 212-line worker. Wrapper keeps the original
entry-point name so the existing call sites in web_server.py continue
to work without changes.
What `run_tidal_discovery_worker` does:
1. Pause enrichment workers (release shared resources).
2. For each Tidal track:
- Cancellation gate (state['cancelled']).
- Discovery cache lookup; cache hit short-circuits the search.
- SimpleNamespace-style track passed straight to
`_search_spotify_for_tidal_track` (the shared helper used by every
worker in this family).
- On Spotify match: build `match_data` preserving track_number /
disc_number from raw API data, image extracted from album images
or track object fallback, release_date filled from
track.release_date when album dict is missing it.
- On iTunes match: dict result populated as `match_data` with source
set to discovery_source, image extracted from album images.
- Save matched result to discovery cache.
- On miss: Wing It stub stored as 'wing-it' status (success ticked).
3. After all tracks: phase='discovered', activity feed entry, sync
discovery results back to mirrored playlist via
`_sync_discovery_results_to_mirrored` with 'tidal' tag.
4. On error: state['phase']='error' + status with error string.
5. Finally: resume enrichment workers.
Dependencies injected via `TidalDiscoveryDeps` (13 fields) —
tidal_discovery_states, spotify_client, plus 11 callable helpers
(pause/resume enrichment, get_active_discovery_source,
get_metadata_fallback_client, get_discovery_cache_key, get_database,
validate_discovery_cache_artist, search_spotify_for_tidal_track,
build_discovery_wing_it_stub, add_activity_item,
sync_discovery_results_to_mirrored). Same surface as the deezer worker.
Diff vs original after `deps.X` → global X normalization is **zero
differences** — 212 lines orig = 212 lines lifted, byte-identical body
(including all whitespace, comments, log strings).
Tests: 9 new under tests/discovery/test_discovery_tidal.py covering
cache hit short-circuit, Spotify tuple match (track/disc preservation),
iTunes dict match path, Wing It fallback, cancellation, completion
phase update, activity feed entry, mirrored sync invocation, per-track
error handling.
Full suite: 1299 passing (was 1290). Ruff clean.
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