nx_gamehud_gate.nx

nx_gamehud_gate.nx -- certification gate for nx_gamehud (gamebench capability 18 ui-menus-hud). The bug classes each tooth exists to kill (every one shipped in a real engine somewhere): T1 stale HUD -- HUD renders CACHED text instead of the live bound value T2 impure render -- same state renders different pixels (kills replay/lockstep evidence) T3 cursor clamp -- menu cursor clamps at the ends instead of wrapping (MUTATION TARGET) T4 modal residue -- closing a menu does not restore the exact pre-menu frame T5 out-of-bounds -- off-screen text/panel writes past the framebuffer (canary proves it can't) T6 save amnesia -- HUD/menu state does not survive nx_gamesave round-trip (parts-compose tooth) T7 nondeterminism -- the same nav script produces different selections/frames on a second run T8 anti-vacuity -- guards that the equality teeth compared REAL ink and REAL distinct choices (GX-9 law: a green gate that cannot fail is not evidence; T8 must stay GREEN under mutations) license_tier: ORIGINAL expect_exit: 0