[plan] Upgrade MCP Go SDK to v1.2.0

[github-actions]

Objective

Upgrade the MCP Go SDK dependency from the current pseudo-version to the stable v1.2.0 release to gain security fixes, stability improvements, and new MCP spec features.

Context

The current version v1.1.1-0.20251212184941-875d1d30c2af is a pseudo-version. The v1.2.0 release (2025-12-22) includes critical improvements for streamable transports, security enhancements, and new features.

Approach

1. Update go.mod:

   go get github.com/modelcontextprotocol/go-sdk@v1.2.0
   go mod tidy

2. Run the full test suite to verify compatibility:

   make test

3. Test MCP server functionality manually:

   ./gh-aw mcp list
   ./gh-aw mcp inspect --inspector

4. Review v1.2.0 changelog for any API changes that might affect our usage

Files to Modify

• go.mod - Update dependency version
• go.sum - Automatically updated by go mod

Acceptance Criteria

• go.mod shows github.com/modelcontextprotocol/go-sdk v1.2.0
• All tests pass (make test)
• MCP server starts and tools are accessible
• Gateway functionality verified
• No deprecation warnings or breaking changes
  Related to [plan] Upgrade MCP Go SDK to v1.2.0 and implement improvements #7711

AI generated by Plan Command for discussion #7710