Development record

DECISIONS.md violates its own newest-last ordering in five places (backwards date steps among the 247 dated bullets), and nothing gates it. Do not reorder — reordering is what append-only forbids, and a naive date-monotonicity rule would refuse honest back-dated tail entries. Gate the position instead: a CI check that every line a diff adds to DECISIONS.md lands at the tail, never inserted above an existing entry.