Lifted-then-not-deleted leftovers from the PR378 merge:
- web_server.py `_resolve_album_group` and `_build_final_path_for_track`
were already imported at module top from `core/imports/`. Removed the
shadowing local copies.
- Mutagen reimports (FLAC/MP4/OggVorbis) at L17736-17738 shadowed the
top-of-file imports. Picture/MP4Cover/MP4FreeForm were unused. Dropped
the whole block.
- core/imports/context.py: `getattr(artist, "name")` -> `artist.name`
(B009).
Ruff clean, 667 tests pass.
- Cover search_result fallback normalization and ambiguous album detection.
- Add staging metadata, multi-disc path, and MusicBrainz enrichment cases.
- Move the single-track context test next to the imports code it exercises.
- keep single-track import lookup in imports/resolution.py
- normalize simple-download search_result data before wishlist matching
- run wishlist cleanup for simple-download post-processing
- keep source-only artist detail on resolved names and MB short-circuit
- Move app-wide task and activity registries out of core/imports
- Share one runtime-state module across the web server, API, and import pipeline
- Keep import-specific helpers focused on context and post-processing
- Move import flow modules into a dedicated package
- Update app and test imports to the new namespace
- Group the import-focused tests under tests/imports
