Files named '01 - Sun It Rises.flac' with no embedded title tag leaked the stem,
number and all, into tracks.title as '01 - Sun It Rises' — which never matches the
canonical 'Sun It Rises', so the real track reads as a false 'missing' and albums
sort wrong.
New conservative strip_leading_track_number (paths.py): removes a clear track-number
prefix (zero-padded number, OR a number followed by a real separator+space) while
leaving titles that merely start with a number untouched — '7 Rings', '99 Luftballons',
'50 Ways to Leave Your Lover', '1-800-273-8255', '1979' all preserved. Never reduces
to empty/bare-number/punctuation.
Applied at:
- get_import_clean_title (context.py) — the universal resolver every import path funnels
through, so the DB title AND the re-written embedded tag come out clean.
- album_matching scorer — so '01 - Sun It Rises' scores against 'Sun It Rises' and the
file matches its real track (inheriting the clean canonical name).
27 targeted tests + 772 imports/matching green.
