added sandbox and bash tool

tools/bash.py

@@ -0,0 +1,24 @@
+async def bash(command: str, sandbox=None) -> str:
+    """
+    Execute a bash command in the sandbox.
+
+    Args:
+        command: Shell command to run
+        sandbox: PodmanSandbox instance
+
+    Returns:
+        Command output (stdout + stderr)
+    """
+
+    if sandbox is None:
+        return "Error: Sandbox not available"
+
+    try:
+        result = await sandbox.run(command)
+        return result
+
+    except RuntimeError as e:
+        return f"Error: sandbox execution failed: {e}"
+
+    except Exception as e:
+        return f"Error: Unexpected failure: {e}"