ACP agents now get an MCP server at http://127.0.0.1:7600/mcp that
proxies tool calls through the automation WebSocket to the browser,
where they execute against the live editor store. No separate
subprocess, no stale npm package — tools operate on the open canvas.
- Add /mcp endpoint to automation bridge (Streamable HTTP transport)
- Each MCP tool call → sendToBrowser({command:'tool'}) → browser executes
- Strip mcp__open-pencil__ prefix from tool names in chat UI
- Export paramToZod from MCP package for bridge reuse
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