Old rar volumes: .s–.v only, not .x64/.x86

d4e53ca's .[s-z]NN took "Electric.Rain.Swift.3D.PS.v1.0.142.x64" for a
volume, so x86 and x64 builds would be one release.

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

tests/unit/release/identity.spec.ts

@@ -304,6 +304,7 @@ test.group('release / par2 names', () => {
     // A season stays.
     assert.equal(fileStem('the.office.us.s01.rar'), 'the.office.us.s01')
     assert.equal(fileStem('Some.Show.S01'), 'Some.Show.S01')
+    assert.equal(fileStem('Electric.Rain.Swift.3D.PS.v1.0.142.x64'), 'Electric.Rain.Swift.3D.PS.v1.0.142.x64')
     assert.equal(fileStem('chappelle1.part02.rev'), 'chappelle1')
     assert.equal(fileStem('chappelle1.rev'), 'chappelle1')
     assert.equal(fileStem('VwE3i90MVX9dqMFuDfzdS7Q6.part1.par2'), 'VwE3i90MVX9dqMFuDfzdS7Q6')