feat: add MCP support

[ibuildthecloud]

Example

chat: true
tools: arbtrary-tool-name

You're an expert at SQLite. Ask the user how you can help them.

---
name: arbtrary-tool-name

#!mcp
{
  "mcpServers": {
    "sqlite": {
      "command": "docker",
      "args": [
        "run",
        "--rm",
        "-i",
        "-v",
        "mcp-test:/mcp",
        "mcp/sqlite",
        "--db-path",
        "/mcp/test.db"
      ]
    }
  }
}