REBUILD.md: the merger's name, inner and sidecar passes

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

REBUILD.md

@@ -247,6 +247,13 @@ files the set describes, into the one with the most files (chunks,
 candidates, inspections, counts; the par2's shared name when none was
 readable); `release_merges` keeps what went where. Obfuscated uploads whose
 files were each a release of their own (`lone` candidates) become one.
+Readable files have no hash: a name pass (2026-10-23) joins the releases
+of the set's poster in its group posted within 12 hours whose files the
+set all names (no case or punctuation; sidecars, par2 and images aside),
+as `via = 'name'`: an album's tracks and its index, an index beside its
+differently spelled video. `releases:merge-names` for sets from before.
+Also merged: lone files whose inner names share a random stem (`inner`),
+and small sidecar-only releases into their upload (`sidecar`).
 It reads what's new an hour (`created_at`) at a time, its place kept after
 each, and merges only the sets held or matched by two releases or more; a
 file whose first 16 KiB and size more than 20 files share is a common one and