Join an upload's releases by its par2 set's file names

The files of one upload often became several releases whose names
differ slightly: scene tracks apart from their album's nfo/sfv/par2,
"Vermaechtnis" beside a garbled "Vermächtnis", an index named
Die.Bergretter.S18E05... beside its video wishtv-diebergretter-s18e05.
The par2 merge joined releases only by first-16-KiB hashes, which
readable files never get. A name pass now looks, for every set the
merger finds, at the set poster's releases in its group posted within
12 hours: those whose files the set all names (without case or
punctuation, Latin-1-read UTF-8 read back; sidecars, par2 and images
aside) join the set's release, within the hash pass's file bound.
Merges are kept in release_merges as via 'name'. releases:merge-names
runs it over the sets found before; on 300 recent sets 22 merges of 147
releases, all one upload each.

Also: volumes split after .wmv, .mov, .mpg and other video extensions
share a stem ("Morning Lovers.wmv.001" to ".058" were 58 releases), in
the Rust edge and the TypeScript identity.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/unit/release/identity.spec.ts

@@ -16,6 +16,10 @@ test.group('release / fileStem', () => {
     assert.equal(fileStem('lJzuoIKA3T8xjzAD3vqtw0.part036.rar'), 'lJzuoIKA3T8xjzAD3vqtw0')
     assert.equal(fileStem('Some.Movie.2024.r07'), 'Some.Movie.2024')
     assert.equal(fileStem('Some.Movie.2024.mkv.001'), 'Some.Movie.2024')
+    // Other video split too, one release (58 were).
+    assert.equal(fileStem('Morning Lovers.wmv.001'), 'Morning Lovers')
+    assert.equal(fileStem('Morning Lovers.wmv.058'), 'Morning Lovers')
+    assert.equal(fileStem('clip.mov.12'), 'clip')
     assert.equal(fileStem('Some.Movie.2024.2160p.WEB-DL.H.265.mkv'), 'Some.Movie.2024.2160p.WEB-DL.H.265')
     assert.equal(fileStem('Some.Movie.2024.H.264.nzb'), 'Some.Movie.2024.H.264')
     assert.equal(fileStem('Some.Movie.2024.vol127-128.par2'), 'Some.Movie.2024')