Add M7.2 MCP client support with McpStep, CLI commands, and stdio transport

tests/fixtures/mcp_test_server.py

@@ -0,0 +1,44 @@
+"""Small real MCP stdio server used by the client integration tests."""
+
+import os
+import time
+
+from mcp.server.fastmcp import FastMCP
+
+
+server = FastMCP("CmdForge MCP test server")
+
+
+@server.tool()
+def echo(message: str) -> str:
+    """Return a message unchanged."""
+    return message
+
+
+@server.tool()
+def add(a: int, b: int) -> dict[str, int]:
+    """Add two integers."""
+    return {"sum": a + b}
+
+
+@server.tool()
+def read_env(name: str) -> str:
+    """Return an environment value, or an empty string if absent."""
+    return os.environ.get(name, "")
+
+
+@server.tool()
+def current_directory() -> str:
+    """Return the server process working directory."""
+    return os.getcwd()
+
+
+@server.tool()
+def wait(seconds: float) -> str:
+    """Block for the requested duration."""
+    time.sleep(seconds)
+    return "done"
+
+
+if __name__ == "__main__":
+    server.run(transport="stdio")