nx_underridge_nevergate.nx

nx_underridge_nevergate.nx -- the NEVER-BREAK-THE-TOILET gate. Rule 26 ("never brick the electronics") in PHYSICAL form: the porcelain GLAZE is the brand-critical hardware, and the cleaner must be UNABLE to crack/scratch it -- proven MECHANICALLY here, never asserted as a promise. Every check is computed from the part's real design parameters (mm; sigma in MPa = N/mm^2, so bending force comes out directly in newtons). NB1 GLAZE-CONTACT = PAD ONLY : pad stands proud of the printed lip -> only the soft, glaze-safe pad ever touches porcelain (no plastic, no metal). NB2 NO SHARP EDGES : every glaze-facing edge is filleted >= min radius. NB3 CANNOT WEDGE : head stack + clearance <= measured rim gap (won't jam/crack). NB4 SACRIFICIAL NECK : the neck yields BELOW any rim-cracking pry force, yet ABOVE real scrub force -> the TOOL breaks before the toilet does. NB5 GLAZE-SAFE CHEMISTRY : non-scratch pad declared + never bleach+acid. NB6 SECURE MOUNT : >=1 mount point so the head can't drop into the bowl. The gate is LIAR-KILLABLE: it runs the REAL params (must be all-GREEN) AND a TAMPERED set (thin pad + over-thick neck) which it must correctly flag RED. Green only if it discriminates. expect_exit: 0 license_tier: ORIGINAL