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>

start/env.ts

@@ -74,6 +74,9 @@ export default await Env.create(new URL('../', import.meta.url), {
   SPOT_STANDALONE_AFTER_HOURS: Env.schema.number.optional(),
   CORPUS_AHEAD: Env.schema.number.optional(),
   PROBE_PIPELINE: Env.schema.number.optional(),
+  PENDING_SHARE: Env.schema.number.optional(),
+  PENDING_MIN_PROBES: Env.schema.number.optional(),
+  PENDING_MAX_NAMED: Env.schema.number.optional(),
   SPOOL_AHEAD_PER_LEASE: Env.schema.number.optional(),
   SPOOL_MIN_AHEAD: Env.schema.number.optional(),
   SPOOL_MAX_GB: Env.schema.number.optional(),