Add post-fill validation for visible watermarks

tests/test_api.py

@@ -21,6 +21,8 @@ class TestTopLevelExports:
         from remove_ai_watermarks import openai_provenance
 
         assert raiw.remove_visible is api.remove_visible
+        assert raiw.remove_visible_detailed is api.remove_visible_detailed
+        assert raiw.VisibleRemovalResult is api.VisibleRemovalResult
         assert raiw.visible_provenance is api.visible_provenance
         assert raiw.verify_openai_synthid is openai_provenance.verify_openai_synthid
         assert raiw.OpenAIProvenanceError is openai_provenance.OpenAIProvenanceError
@@ -64,6 +66,16 @@ class TestRemoveVisibleArray:
         assert removed == []
         assert result.shape == arr.shape
 
+    def test_detailed_no_mark_result_is_explicit(self):
+        arr = np.zeros((256, 256, 3), np.uint8)
+
+        report = raiw.remove_visible_detailed(arr, backend="cv2")
+
+        assert report.status == "no_watermark"
+        assert report.labels == []
+        assert report.marks == ()
+        assert np.array_equal(report.image, arr)
+
     def test_bad_source_raises(self, tmp_path):
         with pytest.raises(ValueError, match="Could not read image"):
             raiw.remove_visible(tmp_path / "nope.png")
@@ -83,6 +95,14 @@ class TestRemoveVisiblePath:
         result, _ = raiw.remove_visible(DOUBAO, backend="cv2")
         assert result.ndim == 3
 
+    def test_detailed_result_reports_post_removal_status(self):
+        report = raiw.remove_visible_detailed(DOUBAO, backend="cv2")
+
+        assert report.status == "cleaned"
+        assert any("Doubao" in label for label in report.labels)
+        assert len(report.marks) == 1
+        assert report.marks[0].confidence_after is not None
+
 
 class TestNoOpPreservesOriginal:
     def test_no_mark_copies_original_bytes(self, tmp_path):