chore: release v1.4.0

[github-actions]

🤖 New release

• rmcp-macros: 1.3.0 -> 1.4.0
• rmcp: 1.3.0 -> 1.4.0

Changelog

rmcp-macros

1.4.0 - 2026-04-09

Added

• (macros) auto-generate get_info and default router (#785)

rmcp

1.4.0 - 2026-04-09

Added

• add Default and constructors to ServerSseMessage (#794)
• add meta to elicitation results (#792)
• (macros) auto-generate get_info and default router (#785)
• (transport) add which_command for cross-platform executable resolution (#774)
• (auth) add StoredCredentials::new() constructor (#778)

Fixed

• (server) remove initialized notification gate to support Streamable HTTP (#788)
• default session keep_alive to 5 minutes (#780)
• (http) add host check (#764)
• exclude local feature from docs.rs build (#782)

Other

• update Rust toolchain to 1.92 (#797)
• unify IntoCallToolResult Result impls (#787)

---

This PR was generated with release-plz.