nx_ctrlbyte_gate.nx

nx_ctrlbyte_gate.nx -- CONTROL-BYTE CORRUPTION TOOTH (debt 1785520719 / 1785521381, 2026-07-31). THE WOUND: 210 .nx sources had ONE LINE INSIDE putn overwritten by a run of 0x0E (Shift-Out) bytes. Every organ so hit printed EMPTY status=, bytes= and counts -- a fleet of blind instruments. It survived because BOTH existing rulers called it healthy: nx_srcguard rules on SYMBOLS (a line replaced inside a function changes no top-level symbol, so it can never fire) and nx_fs read RENDERS A 0x0E RUN AS AN INNOCENT BLANK LINE. A symbol ruler and a byte ruler answer DIFFERENT questions; the corpus had only the first. This is the byte ruler: any byte outside {tab, LF, CR, printable, UTF-8 >=0x80} in a .nx file is RED. A rule nothing must remember beats a list nobody maintains. verbs: scan [dir] | selftest <writable-scratch-dir> expect_exit: 0 license_tier: ORIGINAL