nx_optenforce_gate.nx

nx_optenforce_gate.nx -- GATE for LN2 option / null enforcement (lang.plan rung LN2, symbol opt_enforce_unwrap). The rung's done-rule: a pointer or Option value must be unwrapped through a checked path before deref in checked mode; the sentinel-zero deref class is REFUSED at compile time on a fixture, and the stdlib still builds. Subjects: the toolchain compiler (argv[1], default the live builder) + runtime/nx_option_enforce.nx (hazard) + nx_option_enforce_ok.nx (every narrowing idiom, the positive control) + nx_option_enforce_reassign.nx (un-narrowing). Driver = nx_ccgate_lib. Data captures in /tmp/nxoe/, RUNNABLES under _build/ (NAS /tmp noexec). Usage: nx_optenforce_gate [compiler_elf] (CWD = the tree root, like nx_cc_equiv_gate) license_tier: ORIGINAL No hw writes (Rule 26).