Minimal Go MCP server for Embr platform retest (June 2026).
Uses the official github.com/modelcontextprotocol/go-sdk to expose two tools
(get_weather, get_time) over MCP streamable-HTTP at /mcp.
Wires both /mcp and /mcp/ to avoid trailing-slash redirect surprises with
Embr ingress.
Companion samples: embr-foundry-tool-sample(-node|-dotnet) cover Python,
Node, and .NET MCP SDKs.