nx_presence_gate.nx

nx_presence_gate.nx -- REFEREE for MEDIA-STUDIO R2 (nx_presence). 64x64 RGB frames, neutral-gray background (128,128,128), skin = (200,120,90). PERSON : a 32x32 skin blob -> high skin + high concentration -> PRESENT. EMPTY : bare gray room -> ~0 skin -> ABSENT. OBJECT : a 32x32 BLUE block (40,80,200) moving in -> not skin -> ABSENT. (operator's case: something moving but NOT a person = dead air.) SCATTER : the SAME number of skin pixels as PERSON, sprinkled across the whole frame. NEG-CONTROL: equal skin fraction but low concentration -> ABSENT. Proves presence needs a coherent blob, not merely skin-coloured pixels (metric != raw skin count). Plus unit checks of the skin classifier on known colours. Every measured value PRINTED. stdout + knowledge/status/presence_gate.log. Exit 0 GREEN / 1 RED. Sovereign: syscalls + nx_image + nx_presence. license_tier: ORIGINAL