Release v0.42.0

What's Changed

• HTTP Sampling Improvements by @ezynda3 in #601
• feat: update type definition of _meta field to text/blob resources. by @rabbah in #591
• fix: documentation typos by @Artmorse in #608
• fix: prevent tools invocation without valid session initialization by @ezynda3 in #607
• fix: make transport Start() idempotent to resolve issue #583 by @ezynda3 in #606
• feat: extend resource middlewares to resource templates by @tjhop in #582
• Preserve Tool _meta when marshaling to JSON by @jaredly in #609
• fix: reuse sessions correctly in streamable HTTP transport by @ezynda3 in #615
• Add support for Session-specific resources by @jaredly in #610
• feat: Add session resource helper functions by @ezynda3 in #617
• [disable-stream] Add WithDisableStreaming option to StreamableHTTP server to allow disabling streaming by @jaredly in #613
• feat: add HTTP client option to OAuthConfig by @sd2k in #616
• feat(mcp): Add WithAny for flexible tool properties by @otaviof in #618
• 📝 Add docstrings to issue-345-withany by @coderabbitai[bot] in #619

New Contributors

• @rabbah made their first contribution in #591
• @Artmorse made their first contribution in #608
• @jaredly made their first contribution in #609
• @otaviof made their first contribution in #618
• @coderabbitai[bot] made their first contribution in #619

Full Changelog: v0.41.1...v0.42.0