* test(#2945): prove phase complete checkbox ignores traceability row rejection
Failing-first regression for #2945. cmdPhaseComplete flips the REQUIREMENTS.md
checkbox unconditionally and never rolls back when the traceability row exists
but rejects the Status write (Deferred/Blocked), so a deferred requirement reads
as shipped. Rows 1-2 assert the checkbox stays [ ] for Deferred/Blocked; Row 3
guards the forward-status flip; Row 4 covers the no-row boundary.
* fix(#2945): roll back the REQUIREMENTS checkbox when the traceability row rejects the write
cmdPhaseComplete's inline requirement-write loop flipped the REQUIREMENTS.md
checkbox unconditionally and kept the flip when the traceability row existed but
rejected the Status write (Out/Deferred/Blocked), so a deferred requirement read
as shipped — the #2788 defect-2 fix was written into cmdRequirementsMarkComplete
(milestone.cts) only, never the phase.cts inline copy.
Port the rollback: capture beforeCheckbox, track tableHit in the
updateTraceabilityCell callback, and when reqUpdate.ok && !tableHit (row existed
but rejected the write), restore beforeCheckbox. The two surfaces can no longer
silently diverge. Forward-status rows (Pending/In Progress/Gaps Found) still flip
+ advance; absent rows still flip (nothing to disagree with).
* chore(#2945): add changeset fragment
* chore(#2945): backfill changeset PR number 3073
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Co-authored-by: sim <sim@local>
