Add temporal OOM backoff for latent upscale

tests/test_dumas_h3_longvideos.py

@@ -1184,6 +1184,18 @@ class DumasH3LongVideosHelperTests(unittest.TestCase):
         bounds = latent._temporal_segments(124, 85, 17)
         self.assertEqual(bounds, [(0, 85), (68, 124)])
 
+    def test_shrink_temporal_param_reduces_chunk_length(self):
+        latent = importlib.import_module("dumas_h3_latent_upscale")
+        smaller = latent._shrink_temporal_param({
+            "chunk_length": 85,
+            "temporal_overlap": 17,
+        })
+        self.assertIsNotNone(smaller)
+        self.assertLess(smaller["chunk_length"], 85)
+        self.assertLess(smaller["temporal_overlap"], 85)
+        self.assertEqual(smaller["chunk_length"] % 17, 0)
+        self.assertEqual(smaller["temporal_overlap"] % 17, 0)
+
     def test_compose_persistent_does_not_expand_ambiguous_plural_to_full_cast(self):
         active = self.module.parse_wardrobe(
             "Maya = she, red jacket\n"