Counters: a total padded wider than its index is none; report diff on shared ranges

- "Very Best Of The Who [01/010]", "[02/020]", "[07/070]": a posting tool's
  total of index×10, so every track had a total of its own and was a
  release of its own. A total zero-padded wider than its index is no
  counter ("[001/010]" still is).
- corpus_sweep.py report compares builds over the ranges both replayed (the
  corpus grows between builds).

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('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')}] - "${n}" yEnc`, name: n, weak: false })!
+    assert.equal(who(3, "The Who - 01 - I Can't Explain.mp3").key, who(4, 'The Who - 02 - Anyway.mp3').key)
+    assert.isUndefined(who(3, "The Who - 01 - I Can't Explain.mp3").fileTotal)
+  })
+
   test('a leading date numbers no item; a file name repeated in the subject goes everywhere', ({ assert }) => {
     const id = (subject: string, name: string, poster = 'p') => releaseIdentity({ poster, subject, name, weak: false })!
     const show = (n: string) => id(`#sterntuary - Jeff Rense Radio Program - "${n}" yEnc`, n, '#sterntuary <aa@aa.com>')