nx_connect_msg.nx

nx_connect_msg.nx -- ACTUAL FUNCTIONALITY rung: the CONNECT messaging core. The real chat primitive that Telegram/Messenger/WeChat are built on -- here, sovereign and content-blind. Delivers + gates: ordered per-conversation message log (monotonic seq); delivery state machine (sent->delivered->read, no backward); edit + delete-for-all (tombstone); multi-device DELTA sync (since-cursor: a device that has up to seq N fetches only seq>N); OFFLINE-SAFE dedup (idempotent by client message id -- a resent message is stored once); and CONTENT-BLIND storage -- the server holds only ciphertext; the per-conversation key lives only on clients, so the server can read ZERO plaintext (measured) -- vs WeChat, whose server reads + censors everything. HONEST: the cipher here is an additive keyed transform STANDING IN for the production AEAD (ecosystem ChaCha20/AES-GCM) -- it proves the content-blind INFORMATION FLOW (server never holds plaintext/key), not cryptographic strength. So content-blind flips to PRESENT (gated), not PARITY/EXCEEDS. 7 checks incl. negative controls. 100% sovereign. license_tier: ORIGINAL expect_exit: 0