The closure walk rebuilt its seen-set with assoc — which on this kernel
copies the entire hashtable per call — and stacked pending cids with
concat; pack-cids then insertion-sorted the result. All three are
quadratic, which surfaced the moment a real repo (4.5k files) went over
the wire: a single push spent an hour in the walk. The seen-set is now a
private dict mutated in place (dict-set!, the acl engine's own pattern),
pending cids are cons-stacked, and packs are unsorted (order is
irrelevant to the receiver). Wire suite stays 78/78; every clone/fetch/
push on repo-scale histories now walks each object once.
lib/gitea/import.sx: working-tree importer — file-read + http-request
adapt the Phase 3 wire client to a live server (gitea/http-app);
staging (deterministic commits, so an interrupted import replays to
identical CIDs and resumes without re-pushing) is separate from the
single delta push; pack lines that exceed the pkt limit are skipped and
reported.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
