Foundation for the decomposition-coverage and roll-up AC-verification gates.
Acceptance criteria were a flat list[str] with no per-criterion identity, so
nothing could relate a child task's criteria to the parent's — letting a PM drop
half a parent's ACs unnoticed (PR #175).
- migration 036: additive acceptance_criteria_ids + parent_ac_refs array columns;
backfills stable md5(task_id:index) ids for existing rows.
- Task model + TaskCreateRequest + db table: the two fields.
- TaskService.create generates one stable id per criterion (1:1) when absent.
- DelegateInputs.covers_parent_criteria -> child.parent_ac_refs (the linkage),
propagated through create_subtask.
- regression-safe (53 task tests green) + 1 new test.
Coverage gate (spec 2), roll-up AC gate (spec 4), per-dev sequenced queues
(spec 3) build on this. Design: docs/SPEC_AC_GUARDRAILS_2026-06-16.md.
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