nx_ux_triangulate_w3c_kat_test.nx

nx_ux_triangulate_w3c_kat_test.nx -- standalone KAT for the new W3C/MS clauses + per-cluster triangulation. Builds a SYNTHETIC RenderJournal that emulates the browser-demo's paint pattern (background + url_bar + buttons + a11y_role_* + focus + status_bar + content text), runs nx_ux_score_clause across every new clause id, then runs nx_ux_triangulate_cluster per cluster. Non-interactive -- no X11 window, no event loop. This is the substrate-honest validation of the scoring + triangulation engine independent of the GUI demo. Asserts (each via dump_dec): 1. NX_UX_W3C_HTML_SEMANTIC scores >= 5 2. NX_UX_W3C_ARIA_ROLES scores >= 7 (>=3 a11y_role entries) 3. NX_UX_W3C_ARIA_LABELS scores >= 2 4. NX_UX_W3C_DOM_TREE scores >= 7 (>=10 journal entries) 5. NX_UX_W3C_CSS_CONTRAST scores >= 5 6. NX_UX_MS_INCL_EXCLUSION scores >= 6 (a11y + focus + status) 7. accessibility cluster verdict == VALIDATED_S_CLASS or UNVERIFIED (NOT CONFLICTED -- per-cluster scope means weak NN5 doesn't poison accessibility cluster) license_tier: ORIGINAL lineage_id: nishi_ux_triangulate_w3c_kat_q10