add idalib-based MCP server

[williballenthin]

This PR introduces a MCP server for IDA that uses idalib to access the IDAPython API. This means that you can access IDA's analysis on a headless system, without having to open the IDA Pro GUI and launching the plugin.

This MCP server supports both stdio and sse transports. With sse, you could run the MCP server in a container or sandbox for isolation, exposing only the TCP port. Note, however, that you must restrict access to the TCP port appropriately.

Here's Cursor accessing PMA 01-01.dll and collecting the MD5 computed by IDA:

Example use flow:

transport: stdio

1. configure your agent framework to start the MCP server, like .cursor/mcp.json:

{
    "mcpServers": {
        "ida-pro-mcp": {
            "command": "/Users/user/code/ida-pro-mcp/.venv/bin/python",
            "args": ["-m", "ida_pro_mcp.idalib_mcp_server", "--transport=stdio", "/Users/user/code/ida-pro-mcp/pma.dll_"]
        }
    }
}

transport: sse

1. start the server: python -m ida_pro_mcp.idalib_mcp_server --transport=sse /path/to/file/to/analyze.exe
2. configure your agent framework, like .cursor/mcp.json:

{
    "mcpServers": {
        "ida-pro-mcp": {
            "url": "http://localhost:8000/sse"
        }
    }
}

transport tradeoffs

As you can see from above, you have to specify the input file path in the MCP/stdio server configuration, which can be tedious to update. The MCP/sse server can be restarted independently of the agent software and point to different input files (which might be confusing in its own right).

So, perhaps its worth adding a tool to let the agent open the input file (restricted to a given directory, of course), so you could say "open foo.exe and determine its MD5" or something.

closes #20

[mrexodia]

Mostly looks good!

[mrexodia]

Thanks a lot for your contribution and productive discussions!