nx_v128_gate.nx

nx_v128_gate.nx -- F618 STANDING SIMD GATE, POST-FLIP FORM (2026-07-21): proves the v128 SAD path BIT-EXACT vs a pure-scalar reference, mechanically, through the SHARED pipeline (nx_compile_wat -> nx_wat_compiler -> nx_wasm_vm, all carrying the F618 SIMD flip), against the NATIVE authority. Teeth: T1 native reference-equivalence: pvr_* (pre-flip scalar copies) == vm_* natively (the flip did not change a single native result) T2 VM scalar sweep == native (the pipeline lowers the pure-SCALAR reference faithfully) T3 VM SIMD sweep == native (THE CLAIM: real v128 opcodes interpreted == scalar ground truth) T4 micro 16-byte SAD at an UNALIGNED address: VM simd == VM ref == native T5 non-vacuity: the wasm MUST contain 0xFD 0x73 (i8x16.sub_sat_u) sequences -- a stale or scalar-pipeline build cannot fake GREEN (doubles as /tmp-staleness detection) T6 NEGATIVE CONTROL: corrupt ONE frame byte in VM memory -> the simd sweep checksum MUST move usage: build the two STOCK pipeline elfs (nx_sov_build_run nx_compile_wat / nx_wat_compiler --build-only) + this gate, then run /tmp/nx_v128_gate.sov.elf license_tier: ORIGINAL