nx_smtp_client_gate.nx

nx_smtp_client_gate.nx -- GATE for EMAIL R1 (SMTP client, nx_smtp_client). Drives the REAL nx_smtp_client codec + state machine over scripted transcripts (no network, fully deterministic) and asserts: COMPLETENESS : multiline 250 reply parses to code=250/complete=1; 220 greeting + 354 data-go parse; EHLO/MAIL/RCPT/ QUIT/DATA builders emit exact CRLF-framed bytes; dot-stuffing turns a lone "." line into ".." and terminates with <CRLF>.<CRLF>; the state machine walks the full happy path to DONE. NEG-CONTROL : a 550 at RCPT routes the state machine to ABORT/FAIL (no DATA is ever sent to a rejected recipient). TAMPER reply : a continuation line whose code differs from the first line -> CODE_MISMATCH; a non-digit code -> BAD_CODE; a continuation with no final line -> parsed but complete=0 (not treated as a finished reply -- streaming/forgery safe). TAMPER inject: the dot-stuffed body contains the "<CRLF>.<CRLF>" terminator EXACTLY ONCE, at the very end -- a lone "." line cannot prematurely terminate DATA (SMTP injection / truncation defense, RFC 5321 §4.5.2). Evidence -> knowledge/status/smtp_client.log (SMTPCLIENTGATE authored=organ ... verdict=GREEN) license_tier: ORIGINAL