mailrs-mail-builder 1.0.0

RFC 5322 / 2046 / 2047 / 2231 outbound mail builder. Constructs canonically-compliant raw bytes for plain-text, multipart/alternative, and multipart/mixed messages — encoded-word headers, soft-fold lines, CTE selection (7bit / quoted-printable / base64), boundary collision-scan. The inverse of mailrs-rfc5322 + mailrs-rfc2047 + mailrs-mime parse stones.