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Both suites are mutation-verified: reverting the corresponding fix fails 4 of the chat tests and exactly the 3 new self-healing park tests. The self-healing tests carry a positive control asserting the sweep actually reached the tip-already-merged arm -- without it the park assertions passed vacuously against a task shape the candidate filter rejected. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>