nx_nxa_texm_gate.nx

nx_nxa_texm_gate.nx -- THE GATE FOR THE TEXM WRITER. SUBJECT: the nx_nxa_texm ELF, forked for real. The organ's contract is an EXIT CODE plus an ADDITIVE container rewrite, and /api/gate_run derives its verdict from the exit code -- so a gate that only read stdout would test the least load-bearing half. Every tooth asserts either an exit code or a byte read back out of the rewritten container. THE DANGEROUS FAILURE THIS GATE EXISTS TO CATCH is not "TEXM missing". It is TEXM PRESENT AND A PRE-EXISTING SECTION GONE. The floor score would RISE while the asset silently lost its rig, garments or hair -- a regression wearing a win, and exactly what an unverified section-append produces. T3 therefore enumerates ALL THIRTEEN pre-existing tags by name rather than spot- checking, and asserts the section count arithmetic closes. FIXTURES AT RUNTIME, IN /tmp/nx_nxa_texm_gate/, and every subject-created output is UNLINKED at SETUP. A gate that is not idempotent reports on its first run and lies about every run after -- a sibling gate hit exactly that today, where a conf left by an earlier run made correct behaviour read as FAIL. Setup also asserts the unlink WORKED before anything is measured. THE REAL ASSET IS READ, NEVER WRITTEN. Input is the shipped character; every output goes to /tmp. The organ never modifies its input, which is what makes an end-to-end gate on production data safe here. license_tier: ORIGINAL No hw writes (Rule 26). expect_exit: 0