Names: split rar volumes; a file's size in brackets after its counter

- "rld-gtre.r13.002": a split volume after a rar volume is stripped like
  one after .rar (usenet-town's posts were 1,620 single files).
- "[26/32] - [4929] "…part24.rar"": the bracketed size after the counter
  goes (Kingdn's episodes, 2,850 single files).

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

tests/unit/release/identity.spec.ts

@@ -276,6 +276,13 @@ test.group('release / par2 names', () => {
     assert.notEqual(vlad('185', 77, 'P8250001.JPG').key, vlad('234', 77, 'P5300085.JPG').key)
   })
 
+  test("split rar volumes; a file's size in brackets after its counter", ({ assert }) => {
+    assert.equal(fileStem('rld-gtre.r13.002'), 'rld-gtre')
+    const k = (i: number, size: number, n: string) =>
+      releaseIdentity({ poster: 'Kingdn', subject: `Buffy The Vampire Slayer s02e04 [${i}/32] - [${size}] "${n}" yEnc`, name: n, weak: false })!
+    assert.equal(k(26, 4929, 'Buffy s02e04 xvid-tns.part24.rar').key, k(27, 400, 'Buffy s02e04 xvid-tns.vol00+01.PAR2').key)
+  })
+
   test('a total padded wider than its index is no counter', ({ assert }) => {
     const who = (i: number, n: string) =>
       releaseIdentity({ poster: 'p', subject: `Very Best Of The Who [${String(i).padStart(2, '0')}/${String(i * 10).padStart(3, '0')}] - "${n}" yEnc`, name: n, weak: false })!