milestone

Superseded on 2026-09-21 (adr-2609212115255771). The word never had an entry of its own; it lived as a forbidden synonym of phase. Its job, a checkable end condition, is done twice over: each intent's acceptance criteria say when that work is done, and the derived release says what shipped. An intent that must land by a cut says so with target_release (itd-2609212103572513), which the cut reports and carries forward. See record-families.