Branch merge waits for claims

Retired by D24. Agent changes apply immediately; advisory claims never reject edits or branch merges. This code is no longer emitted.

#Common causes

• An older engine build enforced claims.

#Fixes

• Update the engine; edits need no approval or claim release.

• Code: ARA2512

• Constant: collab::MERGE_BLOCKED

• Reported by: ara-collab