nx_lbp_img.nx

nx_lbp_img.nx -- SOVEREIGN face-descriptor RUNG 2 GATE: bridge the LBP descriptor to REAL pixels. Reads real gallery PNGs (nx_png_decoder, RFC2083), luma-grayscales them (nx_lbp_core.rgb_to_gray), and runs the LBP histogram. Proves: decode ok + histogram covers exactly the interior pixels + self-distance is 0 + two distinct images give distinct descriptors (chi2>0). Discrimination of SAME-person vs DIFFERENT-person (measured against the insightface benchmark) is a later rung. Build/run: ./_offc/nx_sov_build_run.elf nx_lbp_img license_tier: ORIGINAL