test(edge): cover ghost/zone env overrides and config defaults

tests/test_config.py

@@ -5,6 +5,12 @@ def test_defaults_when_env_empty():
     assert cfg.device_id == "pi-unknown"
     assert cfg.fall.prone_confirm_s == 3.0
     assert cfg.fall.no_motion_s == 10.0
+    assert cfg.camera_id == "cam-01"
+    assert cfg.cafe24_url == ""
+    assert cfg.secret == ""
+    assert cfg.ghost.reappear_s == 10.0
+    assert cfg.zone.debounce_s == 0.75
+    assert cfg.engine.cooldown_s == 30.0
 
 def test_env_overrides():
     env = {
@@ -12,6 +18,7 @@ def test_env_overrides():
         "CAFE24_URL": "https://x/api/events", "DEVICE_SECRET": "s",
         "FALL_PRONE_S": "2.0", "FALL_NO_MOTION_S": "8",
         "IMMOBILE_S": "90", "COOLDOWN_S": "45",
+        "GHOST_REAPPEAR_S": "7", "ZONE_DEBOUNCE_S": "1.5",
     }
     cfg = load_config(env)
     assert cfg.device_id == "pi-w1"
@@ -21,3 +28,5 @@ def test_env_overrides():
     assert cfg.immobility.immobile_s == 90.0
     assert cfg.engine.cooldown_s == 45.0
     assert cfg.engine.camera_id == "cam-9"
+    assert cfg.ghost.reappear_s == 7.0
+    assert cfg.zone.debounce_s == 1.5