nx_enginelab_driver_gate.nx

nx_enginelab_driver_gate.nx -- END-TO-END gate for nx_enginelab, THE DRIVER. WHAT THIS PROVES THAT nx_enginelab_gate CANNOT. That gate asserts arithmetic properties of the instrument library on fixtures built in memory, and says so in its own verdict: "fixtures whose answers are known by construction". It therefore passes exactly as well when NOTHING drives the library over a real frame -- which is the state the estate was in until nx_enginelab existed. This gate forks the DEPLOYED driver against the REAL engine and asserts on its published report, so a green here means a real renderer was really measured. EVERY TOOTH BINDS TO A DENOMINATOR. A report block that was never printed parses as -1 here, never as 0, so a tooth cannot pass because a field was missing: the field helpers return -1 for "the tag was not printed" and -1 for "the key was not on that tag's line", and the teeth test for positive values. THE FIXTURE-REACHED-THE-CONDITION TEETH COME FIRST and assert the subprocess actually ran and produced bytes, because a harness failure returns an empty capture that would otherwise make every absence-shaped assertion below vacuously true. PARSING IS TAG-ANCHORED AND LINE-BOUNDED. The driver prints several blocks that share key names (q= appears on SUBJECT and on every JOIN row; draws= appears on JOIN and on the named-absence row), so an unanchored search would read one block's data as another's. gdrv_field finds the TAG, bounds itself to that tag's line, and only then looks for the key -- the same positional discipline gv_last_line uses for verdicts. SCRATCH IS PRIVATE AND UNDER /tmp. A gate that shares scratch with a production beat measures the fixture instead of the code; this one writes only under GDRV_DIR, created at SETUP (a teardown does not run when a run crashes). license_tier: ORIGINAL No hardware writes (Rule 26): forks a read-only measurement organ.