2.4.0

• feat(ESM): dual published with ESM support
• feat(packet): encode name compression pointers (RFC 1035 §4.1.4)
• feat(server/udp): negotiated UDP payload size with TC=1 on oversize
• feat(server/tcp): pipeline support (RFC 7766 §6.2.1.1)
• feat(packet): EDNS extended RCODE supported
• feat(server/doh): DoH responses include TTL-derived Cache-Control
• fix(packet): EDNS default UDP payload size raised to 4096
• fix(packet): clamps TTLs to 2³¹−1
• fix(packet): Label and name length validation (RFC 1035 §2.3.4)
• fix(packet): Packet.Header.toBuffer writes Z=0 (RFC 1035 §4.1.1)
• fix(server/doh): accepts any (or absent) Accept header (RFC 8484 §4.1)
• fix(server/doh): DoH POST requires Content-Type: application/dns-message
• style(prettier): update to prettier #129