Why: A LOCAL_READY receipt must permit normal target advancement without accepting a rewind or divergent target history after its observation.
Evidence: Two disposable real Git regressions reproduced erroneous successful recovery before the guard; all 18 task recovery tests pass afterward. Raw SELF receipts are in the task card.
Impact: Reject abnormal target ancestry before receipt import; preserve normal local recovery and strict delivery defaults. Correct stale implementation-stage documentation without activating the queue.
Refs: Documents implementation plan ba4044d U2; independent review R1 and R2; .task/feature-merge-queue-policy-draft.md