nx_engineer_build_gate.nx

nx_engineer_build_gate.nx -- the ENGINEER's MANAGED build: the four-pillar miscompile discipline as ONE standing step, owned by the Engineer historically and going forward, so nobody hand-works-around the register-pressure miscompile again. For any source it runs, in <10ms, the whole pipeline and IGNORES NOTHING: PILLAR 1 GUARD eng_compile_diag -- compile; loud-fail on rc!=0 or empty .s PILLAR 2 PROBE eng_asm_scan -- scan the EMITTED machine code for the live-across- call caller-saved clobber (the miscompile, where it lives) PILLAR 3 HEAL doc_asm_fix -- if found, the Doctor spills/reloads it, additively into a NEW .s (the protected source is untouched) PILLAR 4 VERIFY eng_link+eng_run -- link the (healed) asm and run; classify the outcome Verdicts: COMPILE-FAIL / LINK-FAIL / CRASH(signal) / FAIL(exit) / PASS. out[0]=#regs the Doctor healed, out[1]=signal or exit code. RACI: Engineer detects+verifies, Doctor heals, nobody blesses their own fix. license_tier: ORIGINAL