v3.0.0

Updates:

• Adds Streamable HTTP to Stdio support by @Areo-Joe. More info in README
• Update @modelcontextprotocol/sdk to v1.11.3.
• Add tests on Streamable HTTP to Stdio, concurrency, baseUrl.

Streamable HTTP to Stdio usage:

npx -y supergateway --streamableHttp "https://mcp-server.example.com/mcp"

Stdio to Streamable HTTP incoming soon via #71 by @Areo-Joe.

Thanks to:

• @Areo-Joe
• @griffinqiu
• @folkvir
• @wizizm
• @dtinth
• @rajivml

Full Changelog: v2.8.3...v3.0.0