correct overlapping checkpoint evaluation

scripts/evaluate_yolo_checkpoint_matrix.py

@@ -59,7 +59,8 @@ def dataset_overlap_evidence(dataset_yaml: Path) -> dict[str, Any]:
         return {
             "status": "unavailable",
             "summary_path": str(summary_path),
-            "validation_rows_independent": None,
+            "validation_tiles_non_overlapping": None,
+            "statistical_independence_established": False,
         }
     payload = json.loads(summary_path.read_text(encoding="utf-8"))
     tile_size = payload.get("tile_size")
@@ -69,7 +70,8 @@ def dataset_overlap_evidence(dataset_yaml: Path) -> dict[str, Any]:
             "status": "invalid",
             "summary_path": str(summary_path),
             "summary_sha256": sha256_file(summary_path),
-            "validation_rows_independent": None,
+            "validation_tiles_non_overlapping": None,
+            "statistical_independence_established": False,
         }
     overlap_pixels = max(tile_size - stride, 0)
     return {
@@ -79,12 +81,15 @@ def dataset_overlap_evidence(dataset_yaml: Path) -> dict[str, Any]:
         "tile_size": tile_size,
         "stride": stride,
         "overlap_pixels": overlap_pixels,
-        "validation_rows_independent": overlap_pixels == 0,
+        "validation_tiles_non_overlapping": overlap_pixels == 0,
+        "statistical_independence_established": False,
         "interpretation": (
             "Tile metrics can repeat the same source object and are valid for "
             "candidate ranking only, not independent object-level uncertainty."
             if overlap_pixels
-            else "Tile rows do not overlap according to the dataset summary."
+            else "Tiles do not overlap, but spatial/statistical independence is "
+            "not established because adjacent tiles share AOI context and edge "
+            "objects can remain split."
         ),
     }