Add process controls and restart command

tests/test_restart_command.py

@@ -0,0 +1,23 @@
+from __future__ import annotations
+
+import os
+import signal
+import unittest
+from unittest.mock import AsyncMock, patch
+
+from app.commands.builtins import restart
+
+
+class RestartCommandTests(unittest.IsolatedAsyncioTestCase):
+    async def test_restart_confirms_then_stops_current_process(self) -> None:
+        ctx = type("Context", (), {"reply": AsyncMock()})()
+
+        with patch("app.commands.builtins.os.kill") as kill:
+            await restart(ctx)
+
+        ctx.reply.assert_awaited_once_with("Stopping bot process for restart")
+        kill.assert_called_once_with(os.getpid(), signal.SIGTERM)
+
+
+if __name__ == "__main__":
+    unittest.main()