nx_acquire_gate.nx

nx_acquire_gate.nx -- GATE for nx_acquire_lib, the librarian's door. The subject is a PURE function: aq_decide reads no file and no clock, so this gate needs NO fixture on disk. That matters more than it sounds -- the estate's measured gate-failure modes are dominated by fixtures (a gate sharing scratch with a production beat, a fixture the defect cannot fail, a snapshot gone stale silencing the teeth). A subject with no inputs but its arguments cannot suffer any of them, and every tooth below is decidable from arithmetic alone. THREE BITE-PROVEN NEGATIVE CONTROLS. A rule that has only ever passed is unverified, so each bite pairs an input the rule MUST fire on with one it MUST stay silent on. gv_bite prints VACUOUS when the bad input did not fire and FALSE-POSITIVE when the good one did, so vacuity is SEEN, not counted. license_tier: ORIGINAL