nx_deadair_gate.nx

nx_deadair_gate.nx -- REFEREE for MEDIA-STUDIO R0 (nx_deadair). Frames are 64x48 grayscale, base luma 128. noise_floor=12, active=20 permille. POSITIVE (dead-air): two identical static frames -> activity 0 -> DEAD-AIR. POSITIVE (active): a 16x16 subject block appears -> high activity -> ACTIVE. NEG-CONTROL #1 (noise): per-pixel noise in [-11,+11] (all below the floor). With the floor it MUST read DEAD-AIR. With floor=0 (naive diff) the SAME frame reads ACTIVE -- printed side-by-side to PROVE the floor does real work and the metric is not just raw difference. (metric != raw-diff) NEG-CONTROL #2 (debounce): a single changed pixel MUST read DEAD-AIR, not trip "active" on one hot pixel. Every measured value is PRINTED (no fabricated greens). Evidence -> stdout + knowledge/status/deadair_gate.log. Exit 0 GREEN / 1 RED. Sovereign: syscalls (-> nx_syscalls) + nx_image + nx_deadair only. license_tier: ORIGINAL