Changes touching this path

• the forge refuses an /ingest that would drop a current head it neither descends from nor retires by name (ADR 0098 section 3, map #2422): ingest::heads_this_push_drops judges the declared heads against the heads read at the push generation, before the store transaction, so the CAS makes it sound and a push at a stale generation still loses the swap as before; the walk over the push own changes answers an ordinary push with one read, the head set, and only a head that walk does not reach costs the repo graph, through the landed closure propose already has. a refusal is a 412 whose text body names the count, the remedy (loot pull first) and each head, so a client from before this reads a sentence and this client prints the count it read with the same remedy. retirements ride the signed head declaration as a trailer after the kinds, written only when a push names one, so a push retiring nothing is the old bytes and a forge from before this reads past the names and replaces its heads wholesale as it always did. the client names each forge head its declaration does not reach and that this position has seen, holding the change or naming it in its abandoned record, so abandon --head and supersession are covered with no list of verbs, and never names a head it has not seen. four conformance cases run on the memory store and on Postgres through the assembled forge: a fast-forward carried or already held, a dropped unseen head refused and named with the ref unmoved, an explicit retire that lifts only the head it names, and a racing push that still loses the CAS; a runners test that replaced its root with a new root now retires it by name. red under ten named mutations, each 0 passed and 1 failed (2 failed for the trailer) and restored: no refusal, no generation guard, retirements ignored, no overlay fast path (an existing pin saw the graph read), the overlay alone, the client retiring nothing, the client retiring unseen heads, a view-only seen, the kinds left out ahead of the names, and the client not reading the 412. bash ci/local.sh is green against Postgres 18, 4599 passed over 143 binaries with 13 ignored and the site pg suite at 67 passed. no migration; the forge behaviour changes, so this owes a forge deploy (#2426) e1e5c828 · dbf3dbe6…

Renames are not followed. loot's tree maps a path to an address, so a rename is a delete and an add. This list is the history of the name, not of the bytes.