Changes touching this path

• the forge learns what a proposal IS, with no verb and no route: migration 0011 adds one table keyed by the tip's durable change id and scoped per repo, with no server-minted id, no base column since the declared base is CHECKED rather than stored in generation_expected's own shape, no extent table because a stack is derived and cannot be declared, and no index because both reads are answered by the primary key. The extent is the walk from the tip along parents to the landed frontier, and landed means the closure of ref_head over parents rather than everything the repo holds - a /stow having written repo_change is deliberately NOT landed, which is the difference between the two admission refusals doing their job and failing open. Refusal one is that the walk must terminate at landed changes, and it is an anti-abuse boundary rather than tidiness: an unrooted stack lets any party donate arbitrary unrelated history into someone else's namespace, unbounded, on a host whose quota producer still has none. Refusal two is that every change in the STACK and not merely the tip carries change_id, author and signature, all three of which are NULLable today because a legacy or unauthored change has none - no durable id is unidentifiable, no author is unattributable, no signature is not a contribution under ADR 0041. Each refusal was proved by deleting it and watching the donated or unsigned row be ADMITTED, and a third breakage is worth recording because it does not fail open: swapping the repo-scoped graph lookup for the global one still refuses eventually, but only after the walk has read another tenant's change_node row and it then blames the wrong thing. The ref_head pin is the decision itself and is asserted at three levels - a before-and-after on the declared head set with controls proving the proposal really is on file and its tip really could have been a head, a check that the migration text never names ref_head guarded by a non-vacuity read of its own prose, and a database-level count over a cluster only the shipped code ever wrote, where proposal tips that are a head of their own repo is zero. The reaper was CHECKED rather than assumed and the answer is the ticket's most important output: #493 is decided and not built, and its live set as specified roots on ref_head plus live publications plus un-acked grant blobs - so an OPEN proposal, which is outside ref_head by construction because that is the decision, is reachable from none of them and would be swept, deleting a contributor's offered work while the maintainer was reading it. ADR 0075's terminal sentence is right and its open half needs proposal.tip as a root, argued once in an amendment and filed as #1720. Visibility is a pure predicate and a concealed proposal reads as ABSENT rather than forbidden; no view was added at all, so the invariant that no forge_read view names grant_log or repo_member survives untouched and the reader holds nothing on the base table. The third viewer, the presenting proposer, is a deliberate widening over ADR 0075's letter of two and is recorded as an amendment rather than a comment: the presenter supplied the whole stack so existence discloses nothing they do not hold, and excluding them makes ADR 0075's own named feature - carrying a colleague's signed change - produce a row its creator cannot see (#1649) bc73a1dd · 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.