nx_tls13_server_session_app_data.nx

nx_tls13_server_session_app_data.nx -- application-data layer for a CONNECTED Tls13ServerSession. After the handshake completes (state CONNECTED), the session has derived application traffic keys for both directions: server_app_traffic_key + server_app_iv (for what WE send) client_app_traffic_key + client_app_iv (for what we RECEIVE) Sequence numbers RESET to 0 for the app-data phase per RFC 8446 §5.3. This file ships: nx_tls13_server_session_app_send(session, payload, len, out, cap) Encrypts payload as a TLS application_data record under server_app_*; increments server_app_seq; returns bytes written. nx_tls13_server_session_app_recv(session, record, rec_len, out, cap) Decrypts a TLS record under client_app_*; validates record type is APPLICATION_DATA inside; writes plaintext to out; increments client_app_seq; returns plaintext byte count. This is the substrate primitive HTTPS callers use after handshake to actually serve request/response bytes. license_tier: ORIGINAL