nx_asset_meta_gate.nx

nx_asset_meta_gate.nx -- KAT + TEETH for nx_asset_meta + nx_asset_autotag (R3 of the universal organization-tooling arc). ONE gate, both organs. PROVES the catalog can know WHAT each asset IS and WHICH media are NEAR-duplicates: (a) METADATA (KAT, REAL extraction): - a REAL PNG byte buffer (signature + IHDR, width=320 height=200) -> am_enrich_image populates width="320" / height="200" / encoding_format="image/png" extracted FROM THE BYTES; - those fields ROUND-TRIP through R0's ar_encode -> ar_decode -> ar_get byte-faithfully; - a DOC record -> am_enrich_doc populates dc:title + dc:subject, round-tripping the same way; - TEETH: non-PNG bytes -> am_enrich_image refuses (AM_NOT_PNG), inventing NO dimensions. (b) NEAR-DUP via perceptual hash: - two NEAR-identical grayscale images (a small perturbation) -> at_neardup GROUPS them (Hamming < threshold); - two CLEARLY-DIFFERENT images -> NOT grouped (TEETH: no false-merge); - identical bytes -> Hamming 0 AND same CID (ar_cid). (c) THE WHOLE POINT -- perceptual hash catches a near-dup that exact-CID does NOT: a 1-pixel-changed image has a DIFFERENT CID (ar_cid differs) but a near-zero Hamming distance -> grouped. Both asserted (CID differs AND phash groups). Verdict logged to knowledge/status/asset_meta_gate.log (append-only; ADDITIVE law #13). expect_exit: 0 license_tier: ORIGINAL