nx_video_h2h_gate.nx

nx_video_h2h_gate.nx -- THE REFEREE for the video head-to-head JUDGE (2026-09-02). Subject: nx_video_h2h, the sovereign organ that turns raw strip samples into the video.bench receipt. The gate builds a SYNTHETIC call whose truth is known in closed form -- a sender preview advancing one index every 33 ms, a receiver showing the same indices 120 ms later with indices 50..59 never shown, two index-aligned luma snapshot pairs (one identical, one shifted by exactly +1 everywhere) -- forks the judge on it and asks whether the receipt carries the numbers the fixture planted: glass-to-glass 120000 us, 290 of 300 delivered (966 permil), one stall of 363 ms, the PSNR cap on the identical pair and 48.13 dB on the +1 pair. Negative controls: a second file with a DIFFERENT card sha must read VOID, a reference arm that does not exist must read UNMEASURABLE, and a fixture with a different planted latency must move the median (the number is measured, not constant). A missing judge binary SKIPs (I could not look), never RED. usage: nx_video_h2h_gate [judge-elf] (default _build/nx_video_h2h.sov.elf) exit: 0 GREEN . 1 RED . 3 SKIP license_tier: ORIGINAL No hw writes (Rule 26).