Identity: a set's number before yEnc is no size; names after an arrow

- The unit-less size before the closing yEnc ('"x.mp3" - 8123 yEnc') took
  the set number in 'Newstar Destiny I set 1 [1 of 60] "destiny-001-001.jpg"
  yEnc' once the quotes were gone: 97 sets of 60 were one release. A number
  of fewer than 4 digits after a word stays.
- unquotedName also cuts after "-> " ("… -> [0001 of 0076] ->
  Exclusive-tgirls_000000-lg.jpg"): the arrow was part of the file name.

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

lib/release/identity.ts

@@ -77,8 +77,11 @@ export function subjectRemainder(subject: string): string {
     // File sizes ("76.88 MB", "335555 Bytes", "336573 byt" cut off, "[347K]") differ per file.
     .replace(/\b\d+(?:[.,]\d+)?\s*(?:[kmgt]i?b|bytes?|byt)\b/gi, ' ')
     .replace(/\[\s*\d+(?:[.,]\d+)?\s*[kmgt]\s*\]/gi, ' ')
-    // A size without a unit right before the closing yEnc ("…mp3" - 8123 yEnc").
-    .replace(/\b\d+(\s+yEnc\s*)$/i, '$1')
+    // A size without a unit right before the closing yEnc ("…mp3" - 8123 yEnc"); a short number after a word is a
+    // set's ("… set 1 [1 of 60] "destiny-001-001.jpg" yEnc": 97 sets were one release; LOG.md 2026-10-12 (8)).
+    .replace(/\b(\d+)(\s+yEnc\s*)$/i, (text, n: string, end: string, at: number, s: string) =>
+      n.length >= 4 || !/[A-Za-z0-9]\s*$/.test(s.slice(0, at)) ? end : text
+    )
     // File sizes follow "yEnc" at the end; other numbers (years, post ids) stay.
     .replace(/\byEnc\b(\s+\d+)?\s*$/i, ' ')
     .replace(/\byEnc\b/gi, ' ')