feat(bloom): adaptive shadow v2 + evaluator lockdown - #501
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User re-diagnosis confirmed: the banding attributed to the shadow- adaptive toe was the untagged-color bt601 mis-decode, not the toe. With bt709/tv tagging and the output dither in place, the adaptive toe returns (pool 0.047, driven 0.014, same smooth mask as the lobe attenuation) and measures its best card yet: shadow-clip pools at reference level (six probes with P5 delta ~ 0, dark fractions 0.81-1.03, worst delta 7.4) while the fluid battery stays ALL PASS (G1 +4.2, merge 0.958 / sun 0.938, G5 0.911, rings 0). Evaluators locked down per user direction: color_profile_gate now runs inside bloom_gates.py on every screening, and the batch driver gates every emitted file — the suite can never again miss stream-metadata defects the way it missed the untagged dual. Refs #493, #496 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Reinstates the shadow-adaptive toe (the banding was the color-tag defect, now fixed) with its best measured card: pools at reference level on the shadow clip, fluid battery ALL PASS. color_profile_gate wired into bloom_gates.py and the batch driver so metadata defects can't slip past the suite again. 731/731 unit, lint clean.
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