nx_entity_store_gate.nx

nx_entity_store_gate.nx -- CERTIFICATION of nx_entity_store (gamebench gap-queue rank 1, blocks 7 titles). NOTE: distinct from the pre-existing nx_entity_gate.nx, which is a voxel-world RENDER demo (5 creatures wandering per frame). This gate certifies the handle/generation ENTITY STORE. Nothing shared, no clobber. T1 spawn/destroy/count basics T2 ★STALE HANDLE REJECTED -- destroy an entity, respawn into the SAME slot, old handle must be invalid T2b SLOT REUSE CONFIRMED -- proves T2 hit the real hazard rather than a fresh slot (which passes for free) T4 dense iteration visits exactly the alive set: no holes, no duplicates, no dead entities T5 REPLAY-DETERMINISM -- same op sequence twice -> identical handles and identical iteration order T6 capacity bounded -- spawning past cap returns null and leaves the arena intact T7 components per-entity; a recycled slot leaks nothing from its previous occupant T8 ★ANTI-VACUITY -- valid handles must be ACCEPTED (an always-false en_valid would ace T2) T9 composes with nx_gamesave: entity component data round-trips through save/load license_tier: ORIGINAL expect_exit: 0