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test_gate_decoys.py runs test_check_volume_persistence.py (the blind and crying-wolf probers refused rc=3, `wrote nothing` never CLEAN, the papra signature convicted) and requires it green, so COVERS is a fact; and runs the working-tree gate in a scratch catalog with PATH = ONLY a stub docker that fails every call: a runtime that answers nothing, no docker, nothing to judge are each HARNESS REFUSED rc=3, never 0. An always-succeeding stub is deliberately not used - it would walk the prober into the host filesystem. COVERS gains "volume-persistence". Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS