fix: harden v1.2 trajectory disposal matching

tests/test_engine.py

@@ -250,6 +250,33 @@ class BatchEngineTests(unittest.TestCase):
         self.assertEqual([(event["event"], event["zone_id"]) for event in events], [("batch_discarded", "4")])
         self.assertEqual([batch.zone_id for batch in engine.pending_disposal], ["1"])
 
+    def test_extra_trash_deposits_still_fallback_after_matching_disposal_evidence(self) -> None:
+        settings = EngineSettings(
+            camera_id="test_cam",
+            max_dwell_seconds=1200,
+            trash_confirmation_seconds=120,
+            zone_ids=("1", "2"),
+        )
+        engine = BatchEngine(settings)
+        engine.process(obs(self.t0, {"1": 1, "2": 1}))
+        engine.process(obs(self.t0 + timedelta(seconds=1200), {"1": 1, "2": 1}))
+        engine.process(obs(self.t0 + timedelta(seconds=1300), {"1": 0, "2": 0}))
+
+        events = engine.process(
+            obs(
+                self.t0 + timedelta(seconds=1310),
+                {"1": 0, "2": 0},
+                trash=2,
+                disposal_evidence=[disposal_evidence("1")],
+            )
+        )
+
+        self.assertEqual(
+            [(event["event"], event["zone_id"]) for event in events],
+            [("batch_discarded", "1"), ("batch_discarded", "2")],
+        )
+        self.assertEqual(engine.pending_disposal, [])
+
     def test_same_observation_removal_and_disposal_evidence_discards_newly_pending_batch(self) -> None:
         settings = EngineSettings(
             camera_id="test_cam",