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* fix(engine): SDR content in HLG exports sits at reference white, not peak The sRGB to HLG conversion for DOM layers fed SDR-relative light straight into the HLG OETF, whose input is light relative to the HLG peak, so SDR white landed at 100% signal. Graded HLG footage (graded as SDR, then converted back) and every white overlay were pushed to peak and blew out. SDR white now sits at 75% HLG signal (BT.2408), the same model the PQ branch uses with 203 nits. * docs(engine): shorten the SDR-white note in the HDR LUT * docs(engine): cut the LUT generator's notes to its usage and drift rule