nx_ui_struct.nx

nx_ui_struct.nx -- ui-validation (the DETERMINISTIC, LLM-FREE structural-regression core of the operator's DARPA/Tier-1 hybrid UI-testing architecture, Section 2.A). NO semantic reasoning, NO model: it captures a page's STRUCTURAL FINGERPRINT (the interactive-role + landmark inventory of the DOM = an AXTree-lite over the served HTML) and diffs current-vs-baseline to flag STRUCTURAL REGRESSIONS instantly -- e.g. a <button> silently becoming a <div onclick> (the architecture's exact example: role downgrade = a11y + test-hook regression). Deterministic, ~ms, air-gapped-capable (fork-captures nx_https_get for the fetch only). HONEST ENVELOPE: structural-inventory fingerprint (tag/landmark census + non-semantic-interaction smell), NOT full Zhang-Shasha tree-edit-distance over a real AXTree (that needs the sovereign browser's live accessibility tree = filed next rung). Single baseline at a time. nx_ui_struct baseline <url> [connect] | check <url> [connect] exit: 0 GREEN(no regression) | 3 STRUCTURAL-REGRESSION | 4 fetch/baseline-fail | 2 usage. license_tier: ORIGINAL expect_exit: 0