feat: initialize cold display guard

tests/test_config.py

@@ -0,0 +1,38 @@
+from __future__ import annotations
+
+import tempfile
+import unittest
+from pathlib import Path
+
+from cold_display_guard.config import load_settings
+
+
+class ConfigTests(unittest.TestCase):
+    def test_loads_settings_from_toml(self) -> None:
+        with tempfile.TemporaryDirectory() as tmpdir:
+            path = Path(tmpdir) / "config.toml"
+            path.write_text(
+                """
+camera_id = "cam_a"
+
+[thresholds]
+max_dwell_seconds = 30
+trash_confirmation_seconds = 4
+
+[layout]
+rows = 1
+cols = 2
+""".strip(),
+                encoding="utf-8",
+            )
+
+            settings = load_settings(path)
+
+        self.assertEqual(settings.camera_id, "cam_a")
+        self.assertEqual(settings.max_dwell_seconds, 30)
+        self.assertEqual(settings.trash_confirmation_seconds, 4)
+        self.assertEqual(settings.zone_ids, ("r1c1", "r1c2"))
+
+
+if __name__ == "__main__":
+    unittest.main()