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Michael Suchacz
7720e283f5
## Stack Context PR 4 of 6 in a stack that migrates every Coder MCP surface from the archived `github.com/mark3labs/mcp-go` library to the official `github.com/modelcontextprotocol/go-sdk` v1.7.0. Stack: #28056 -> #28057 -> #28058 -> #28059 -> #28060 -> #28061 ## Why The workspace agent MCP manager now stores `*mcp.ClientSession` per configured server. - stdio servers use `mcp.CommandTransport` with an `exec.Cmd` built from Coder's `agentexec.Execer`, preserving environment enrichment; the command uses the manager's parent context so a stdio subprocess outlives the connect handshake and stops when the session closes. - HTTP and SSE servers use header-injecting HTTP clients. - Binary tool content is re-encoded to base64 for the agent API because the official SDK decodes it into raw bytes. - The reload test now triggers config diffs via an environment variable because the official SDK drops connections on non-protocol stdout output (flags like `-test.v` made the fake server chatty). > Mux created this PR on Mike's behalf.