nx_chat_store_gate.nx

nx_chat_store_gate.nx -- REFEREE for C1 (nx_chat_store, contract cs_store_forward). END-TO-END: writes its own fixture conf (store_root pointed at /tmp/csgate/ so production planes are never touched -- a gate must not share its fixture with a production beat), forks the PROMOTED elf per verb, and reads every answer back from the store through the organ itself. It proves the DONE-RULE pre-declared in comms.plan before the organ existed: "a message sent to an offline member is delivered on reconnect byte-identical and in order; history survives room close; additive-only with soft-delete; REFUSES loudly at its conf-named size budget instead of silently dropping." Process-survival is structural here: EVERY verb is its own fork, so anything T6 replays was written by an earlier, already-dead process. NEGATIVE CONTROLS: reopen, regress, budget-msgs, budget-bytes, body-too-big, room-absent (absent is not empty), bad-kind, double-delete. Fixture rooms are epoch-suffixed so every run is fresh (idempotent gate law) and live in /tmp. license_tier: ORIGINAL expect_exit: 0