The discard sweep beside the lanes, each dropped signature swept once

After aa40222 the prober still idled: a dropped signature's range of the
ladder index is minutes of HDD (309 dropped, 242 with a poster tested on
the rows) and the sweep read the same ranges again every five minutes
inside the claim. Now each dropped class and signature is swept once
(swept_at, migration 7100; null again when the record drops it anew),
20 of each per sweep in rounds of 10k rows, in a loop of its own in the
prober beside the lanes and the namer (LOG.md (133)).

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

REBUILD.md

@@ -935,12 +935,16 @@ f. **Nothing enters the catalog without a usable name** (amended
    target or status 3 (exhausted); each finished climb counts on
    `pending_signatures` for (tool, group, poster) and (tool, group), and a
    signature with PENDING_MIN_PROBES (100) climbs and at most
-   PENDING_MAX_NAMED (0.5%) named is dropped: every five minutes the
-   waiting releases of dropped signatures are discarded (status 2), the
-   rules' `samplePercent` of them left to climb. The namer
+   PENDING_MAX_NAMED (0.5%) named is dropped: a sweep beside the lanes
+   (every five minutes, in its own loop: a signature's rows are minutes
+   of HDD) discards the waiting releases of each dropped signature and
+   class once (`swept_at`; the edge drops their new releases itself), the
+   rules' `samplePercent` of them left to climb (LOG.md (133)). The namer
    (`app/services/pending_namer.ts`, in the prober's process): a named
    release's article span read again from the corpus (the stored range's
-   chunks) or by XOVER on a connection of its own, through the TypeScript
+   chunks) or by XOVER on a connection of its own, a chunk of articles
+   at a time (one string of a wide span topped V8's limit; spans over 3M
+   articles are given up), through the TypeScript
    indexer with `partialFiles` (a file given up short of parts stays a
    partial file of its release, as the Rust window writes it; without it
    the range path's fragment rule left nothing to find: by 2026-10-29