feat: adds cwd to the MCP yaml as an option.

[bdougie]

Description

Now users can configure MCP servers with a current working directory (cwd):

  mcpServers:
    - name: my-project-server
      command: npm
      args: ["run", "mcp-server"]
      cwd: "/path/to/my/project" # this field is new
      env:
        NODE_ENV: "production"

The implementation supports:

• Absolute paths: /Users/developer/project
• Relative paths: ./my-project or ../servers
• Optional usage (backward compatible)

The cwd option will be passed directly to the StdioClientTransport, allowing MCP servers to run in their intended working directory context.

This work unblocks the work I am doing with LanceDB in this repo

https://github.com/bdougie/git_blame_search/?tab=readme-ov-file#continue-integration

Checklist

• I've read the contributing guide
• The relevant docs, if any, have been updated or created
• The relevant tests, if any, have been updated or created

Screenshots

[ For visual changes, include screenshots. Screen recordings are particularly helpful, and appreciated! ]

Tests

Note the tests were generated using Claude. cc @uinstinct for a look to see if they match the work you've already done.

The tests confirm that the cwd is not required and successfully transports the MCP to the current directory.

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[sestinj]

looks good, thanks for the tests + docs

[sestinj]

🎉 This PR is included in version 1.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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