Concrete plan for Option B: new merger.py module with field-by-field
priority merging, duration_ms/disc_id model extensions, cover strategy,
and track-matching logic for sources with differing track counts.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Shorter, cleaner filenames consistent with Jellyfin conventions.
Updated all references in source, tests, and documentation.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
