fix(ci): parse scientific AE metrics

scripts/check_visual_pr.py

@@ -534,11 +534,14 @@ def decoded_pixel_delta(before: Path, after: Path) -> int:
         text=True,
     )
     metric_output = result.stderr.strip() or result.stdout.strip()
-    metric_match = re.search(r"(?:^|\s)(\d+)(?:\s|$)", metric_output)
+    metric_match = re.search(
+        r"(?:^|\s)(\d+(?:\.\d+)?(?:[eE][+-]?\d+)?)(?:\s|$)",
+        metric_output,
+    )
     if result.returncode not in {0, 1} or not metric_match:
         detail = metric_output or f"exit status {result.returncode}"
         raise RuntimeError(f"ImageMagick could not compare the evidence: {detail}")
-    return int(metric_match.group(1))
+    return int(float(metric_match.group(1)))
 
 
 def validate_reference_exporter_differences(

scripts/tests/test_check_visual_pr.py

@@ -11,6 +11,7 @@
 from scripts.check_visual_pr import (
     AUDIT_ROWS,
     INSPECTION_ITEMS,
+    decoded_pixel_delta,
     read_jpeg_info,
     validate_evidence,
     validate_layout_audit,
@@ -466,6 +467,19 @@ def test_native_evidence_cannot_be_added_without_a_difference_report(self):
 
 
 class ReferenceExporterDifferenceTests(unittest.TestCase):
+    def test_decoded_pixel_delta_accepts_scientific_notation(self):
+        with (
+            patch("scripts.check_visual_pr.shutil.which", return_value="/usr/bin/magick"),
+            patch("scripts.check_visual_pr.subprocess.run") as run,
+        ):
+            run.return_value.returncode = 1
+            run.return_value.stderr = "6.83993e+06 (0.759992)"
+            run.return_value.stdout = ""
+
+            delta = decoded_pixel_delta(Path("gt.jpg"), Path("native.jpg"))
+
+        self.assertEqual(delta, 6_839_930)
+
     def prepare_evidence(self, root: Path) -> tuple[str, dict[str, object]]:
         issue_dir = root / "assets/bugfixes/issue-186"
         issue_dir.mkdir(parents=True)