nx_browser_find_gate.nx

nx_browser_find_gate.nx -- gate for FIND-IN-PAGE (the Ctrl+F feature every browser has; UX census had it as an ADMITTED gap -- this flips it, with EVIDENCE). Proves on the real bench page through the real core: (T1) the term "wizards" is FOUND with the right match count; (T2) the first-match page-y is returned (scroll-to target) and really is the paragraph's y; (T3) with the find active the render shows HIGHLIGHT pixels (#FFE066) under the match; (T4) with no find active there are ZERO highlight pixels; (T5) NEG: an absent term matches 0 and highlights NOTHING (the highlighter cannot false-fire); (T6) case-insensitive ("WIZARDS" == "wizards"); (T7) EVIDENCE CLIP recorded: page -> find+highlight -> scrolled-to-match, browser-playable APNG (knowledge/status/usersim_find_clip.png). expect_exit: 0 license_tier: ORIGINAL