The pending ladder in the prober: unnamed releases probed cheapest first, signatures learned, the named moved into the catalog

pending_ladder.ts claims the oldest waiting pending releases' next target
(par2, archive, lone, 7z-tail in that order) as at least PENDING_SHARE of each
claim; a usable name (the largest named file of a par2 set or a listing, or a
lone file's yEnc name, neither packaging nor random) hands the release to the
namer, no name the next target or the end of the climb; climbs count on
pending_signatures per (tool, group, poster) and (tool, group), and a signature
with 100 climbs and 0.5% named or fewer is dropped: its waiting releases are
discarded without a probe, the rules' sample excepted. pending_namer.ts reads
a named release's articles again from the corpus or by XOVER and writes it to
the catalog under the pending key (source weak-stem, the name as inner name)
with its chunk and candidates. Migration 6400; config PENDING_*.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

tests/unit/probe/inspect.spec.ts

@@ -4,7 +4,7 @@ import { readFileSync } from 'node:fs'
 import { crc32 } from 'node:zlib'
 import yencode from 'yencode'
 import { crc32Hex } from '#lib/yenc/index'
-import { inspect, innerName, MAX_NAMES } from '#lib/probe/index'
+import { inspect, innerName, MAX_NAMES, usableName } from '#lib/probe/index'
 
 /** A single-part yEnc article of `data`. */
 function article(data: Buffer, name: string) {
@@ -76,6 +76,19 @@ function rar5File(name: string, size: number, opts: { packed: number; headerFlag
   return rar5Block(2, opts.headerFlags ?? 0, fields, { extra, data: opts.packed })
 }
 
+test.group('probe / usable name (the pending ladder)', () => {
+  test('a par2 or listing that names a real file names the release; random volumes and packaging do not', ({ assert }) => {
+    const base = { size: 1000, type: null }
+    assert.equal(usableName({ ...base, yencName: 'x.par2', names: ['q3B9OrpKiCxUnzgtUGnp.part01.rar', 'Some.Movie.2016.mkv'] }, 'par2'), 'Some.Movie.2016.mkv')
+    assert.isNull(usableName({ ...base, yencName: 'q3B9OrpKiCxUnzgtUGnp.par2', names: ['q3B9OrpKiCxUnzgtUGnp.part01.rar'] }, 'par2'))
+    assert.equal(usableName({ ...base, yencName: 'x.rar', names: ['Folder/Real.Name.S01E01.mkv'] }, 'archive'), 'Real.Name.S01E01.mkv')
+    assert.isNull(usableName({ ...base, yencName: 'x.rar', names: [], passworded: true }, 'archive'))
+    assert.equal(usableName({ ...base, yencName: 'brothalovers.20.02.16.hazel.moore.mp4' }, 'lone'), 'brothalovers.20.02.16.hazel.moore.mp4')
+    assert.isNull(usableName({ ...base, yencName: 'c3453cdd2a3645a8f3cf3d22319abe63' }, 'lone'))
+    assert.isNull(usableName({ ...base, yencName: 'c3453cdd2a3645a8f3cf3d22319abe63.part01.rar' }, 'lone'))
+  })
+})
+
 test.group('probe / inspect', () => {
   test('a par2 index: its files, largest first', ({ assert }) => {
     const setId = Buffer.alloc(16, 3)