nx_gx9_saveload_gate.nx

nx_gx9_saveload_gate.nx -- Gx-9: SAVE / LOAD, the capability the gamebench ruler ranks #1 across the ingested corpus (it blocks 11 of 12 real titles). Demand-ranked by measurement, not chosen by taste. ★THE TEST THAT ONLY WE CAN RUN. Most engines can only check that a save round-trips its fields. Because our pipeline is bit-deterministic, we can assert the far stronger property: SAVING AND RELOADING MUST BE INDISTINGUISHABLE FROM NEVER HAVING SAVED. Play 14 ticks straight and keep the final frame. Then play 7, save, load into a FRESH state, play the remaining 7 -- and require the final frame to be BYTE-IDENTICAL and the final state to match field for field. That catches the entire class of "the save forgot something" bugs, which field round-trip tests structurally cannot see. The other half is refusal: a damaged save must FAIL WITH A REASON, never half-load. A corrupted save that partially applies strands the player in an impossible world and reads as a game bug forever. license_tier: ORIGINAL expect_exit: 0