feat(transport): add SEP-2243 Mcp-Method / Mcp-Name header mirroring with MCP-Protocol-Version validation - #1112

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-java@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/