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Michael Suchacz
c8e8b21a88
## Stack Context PR 5 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 aibridge injected-MCP proxy now owns an official `*mcp.Client`, `*mcp.StreamableClientTransport`, and `*mcp.ClientSession`. - The proxy constructor accepts an optional `*http.Client` instead of mark3labs options; the header-injecting wrapper shallow-copies a supplied client so its Timeout, Jar, and redirect policy survive. - Manual protocol version negotiation and the mark3labs five-second close workaround are removed; the SDK negotiates during `Connect` and fails when no mutually supported version exists. - Repeated `Init` closes the previous session, and a failed tool fetch closes the just-created session so transports do not leak. - Tool and intercept types use the official pointer content types; embedded resource blobs are re-encoded to base64 for model-facing text because the SDK decodes them into raw bytes. - `aibridge/mcpmock` is regenerated, and its stale `go:generate` source path is corrected. > Mux created this PR on Mike's behalf.