fix: make RPM runtime portable on Tumbleweed

tests/test_monitor.py

@@ -52,6 +52,21 @@ class TestIsRoot:
 class TestEnableIdempotentMatrix:
     """§8.6: Period-row idempotent matrix."""
 
+    def test_first_enable_creates_missing_store(self, store_path):
+        """A fresh package install has a store directory but no database yet."""
+        args = MagicMock(now=False, store_path=store_path)
+
+        with patch("fenris.monitor.subprocess") as mock_sub:
+            mock_sub.run.return_value = MagicMock(returncode=0)
+            cmd_enable(args)
+
+        conn = init_store(store_path)
+        row = conn.execute(
+            "SELECT ended_at FROM monitoring_periods WHERE ended_at IS NULL"
+        ).fetchone()
+        conn.close()
+        assert row is not None
+
     def test_first_opens_period(self, store_path):
         """First-ever enable opens a period at the enable moment."""
         # Initialize store