Probe 7z listings and ZIP starts

7z keeps its file list at the end of the archive, so the 7z-tail
candidates (the last segment of the highest volume) were queued but
never probed, and the .7z.001 start only gave the type. The prober now
claims 7z-tail candidates after the archives; lib/sevenzip finds the end
header in the article, decodes the LZMA-packed header (a TypeScript port
of the LZMA SDK's reference decoder) and lists the files with their
sizes. An AES-encrypted header means passworded without names. Names
feed the inner name and the judge's fake rule.

An unsplit .7z of several segments now also gets a tail candidate, and
.zip files an archive candidate: their first segment's local headers
give the first entries and whether they are encrypted. Both in the Rust
edge and the TypeScript indexer.

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

app/services/prober.ts

@@ -20,7 +20,8 @@ type Outcome = { candidate: Candidate; status: 'done' | 'missing' | 'error' | 'w
 
 /**
  * The order candidates are probed in: what the par2 merge needs first (a random-named file's own start, then the
- * par2 sets and archives of releases without a readable name), then the rest (names and passwords of readable ones).
+ * par2 sets and archives of releases without a readable name), then the rest (names and passwords of readable ones),
+ * then 7z listings (the end of a split 7z's last volume; queued from 2026-10-13, probed from 2026-10-23).
  */
 const TIERS: { kind: string; unreadable: boolean }[] = [
   { kind: 'lone', unreadable: false },
@@ -28,6 +29,8 @@ const TIERS: { kind: string; unreadable: boolean }[] = [
   { kind: 'archive', unreadable: true },
   { kind: 'par2', unreadable: false },
   { kind: 'archive', unreadable: false },
+  { kind: '7z-tail', unreadable: true },
+  { kind: '7z-tail', unreadable: false },
 ]
 const FLUSH_MS = 2000
 
@@ -169,7 +172,7 @@ export class Prober {
             }
             this.stats.bytes += body.length
             try {
-              this.outcomes.push({ candidate, status: 'done', inspection: inspect(body) })
+              this.outcomes.push({ candidate, status: 'done', inspection: inspect(body, candidate.kind) })
             } catch (error: any) {
               // Not yEnc, a broken one, or data a parser chokes on: a final answer, not a connection problem.
               if (!(error instanceof YencError)) logger.warn(`Probing ${candidate.messageId}: ${error.message}`)