Identity: per-file hex ids, dated stems, season packs under a bare counter

From the corpus sweep (695 ranges):
- A bracketed hex id per file ("[PRiVATE] Rosewood.S02E08… [1f1793f68d5321]
  [newzNZB] [01/22]") goes from the subject: nEwZ[NZB]'s 32,101 single files.
- A stem that starts with a date is specific enough for the poster-tag rule
  ("09-30-2008_CTC.r00" under "#sterntuary - Coast To Coast Radio Show":
  still one release of 25,188 files, the stem being too short to "describe").
- Episodes under a bare counter ("[01/36] "Pokemon - S02E01 - Pallet Party
  Panic.mkv"") are one release per show, season and counter total.

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

tests/unit/release/identity.spec.ts

@@ -276,6 +276,20 @@ test.group('release / par2 names', () => {
     assert.notEqual(vlad('185', 77, 'P8250001.JPG').key, vlad('234', 77, 'P5300085.JPG').key)
   })
 
+  test('per-file hex ids go; dated stems are specific; season packs under a bare counter', ({ assert }) => {
+    const id = (poster: string, subject: string, name: string) => releaseIdentity({ poster, subject, name, weak: false })!
+    const nz = (hex: string, i: number, n: string) =>
+      id('nEwZ', `[PRiVATE] Rosewood.S02E08.SPANiSH.1080p.HDTV.x264-FCC [${hex}] [newzNZB] [${String(i).padStart(2, '0')}/22] - "${n}" yEnc`, n)
+    assert.equal(nz('1f1793f68d5321', 1, '[05cbdb538a]_x.nfo').key, nz('65e6464bc03cad', 2, '[e8a4e2c182]_x.r03').key)
+    const show = (n: string) => id('#sterntuary <aa@aa.com>', `#sterntuary - Coast To Coast Radio Show - "${n}" yEnc`, n)
+    assert.equal(show('09-30-2008_CTC.nfo').key, show('09-30-2008_CTC.r00').key)
+    assert.notEqual(show('09-30-2008_CTC.r00').key, show('10-01-2008_CTC.r00').key)
+    const ep = (i: number, n: string) => id('p', `[${String(i).padStart(2, '0')}/36] "${n}"`, n)
+    assert.equal(ep(1, 'Pokemon - S02E01 - Pallet Party Panic.mkv').key, ep(2, 'Pokemon - S02E02 - Gotta Catch Ya Later.mkv').key)
+    assert.equal(ep(1, 'Pokemon - S02E01 - Pallet Party Panic.mkv').name, 'Pokemon S02')
+    assert.notEqual(ep(1, 'Pokemon - S02E01 - Pallet Party Panic.mkv').key, ep(1, 'Pokemon - S03E01 - x.mkv').key)
+  })
+
   test("a scene index's files go with the release: no case, no 00-", ({ assert }) => {
     const id = (n: string) => releaseIdentity({ poster: 'SavageCobra <x@y.nhc>', subject: n, name: n, weak: false })!
     const a = id('00-laura_van_dam_-_capture_radio_113-cable-10-10-2026-talion.m3u')