REBUILD.md: lone articles under scrambled names

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

REBUILD.md

@@ -774,7 +774,9 @@ is before frontier − `WINDOW_MS` are judged and written `finished`, as an
 it, else `finished: false, edge: true`. A file short of parts stays in
 its release and sets `partial` (the store: `complete = false`). A lone
 article of a multi-part random file is still counted `per-article`, not
-written. Gone: fragments and the cut-off, `uploads_of` (online now),
+written; before the block's end a scrambled name counts as random too
+(`looks_scrambled`: a random subject and poster per article, 160k of
+alt.binaries.storage's releases; LOG.md (122)). Gone: fragments and the cut-off, `uploads_of` (online now),
 `check.ts` and the fixture comparison (the parity with the TypeScript
 indexer; CI runs `edge/bench-fixtures.sh` instead), the `incomplete` count
 (incomplete releases are kept). The wire carries `finished`, `edge` and