REQ-FUN-005
Store sign-offs with id, subject_kind, subject_id, mode, state, requested_by, created_at
What
The system SHALL store sign-offs with id, subject_kind, subject_id, mode (any-of, all-of), state, requested_by, created_at.
Acceptance
State machine enforced; subject FK enforced via polymorphic check.
Source
OBJ-3.
established project management guidelines Mapping
Sign-off records with mode and state are the formal-acceptance artifact for Validate Scope and Perform Integrated Change Control.