correct overlapping checkpoint evaluation

tests/test_evaluate_yolo_checkpoint_matrix.py

@@ -17,7 +17,8 @@ def test_dataset_overlap_evidence_marks_repeated_validation_rows(
 
     assert evidence["status"] == "overlapping"
     assert evidence["overlap_pixels"] == 256
-    assert evidence["validation_rows_independent"] is False
+    assert evidence["validation_tiles_non_overlapping"] is False
+    assert evidence["statistical_independence_established"] is False
 
 
 def test_dataset_overlap_evidence_is_explicit_when_summary_missing(
@@ -26,4 +27,21 @@ def test_dataset_overlap_evidence_is_explicit_when_summary_missing(
     evidence = dataset_overlap_evidence(tmp_path / "dataset.yaml")
 
     assert evidence["status"] == "unavailable"
-    assert evidence["validation_rows_independent"] is None
+    assert evidence["validation_tiles_non_overlapping"] is None
+    assert evidence["statistical_independence_established"] is False
+
+
+def test_nonoverlap_does_not_overclaim_statistical_independence(
+    tmp_path: Path,
+) -> None:
+    dataset_yaml = tmp_path / "dataset.yaml"
+    dataset_yaml.write_text("path: .\nval: images/val\n", encoding="utf-8")
+    (tmp_path / "yolo_tile_dataset_summary.json").write_text(
+        json.dumps({"tile_size": 512, "stride": 512}), encoding="utf-8"
+    )
+
+    evidence = dataset_overlap_evidence(dataset_yaml)
+
+    assert evidence["validation_tiles_non_overlapping"] is True
+    assert evidence["statistical_independence_established"] is False
+    assert "not established" in evidence["interpretation"]