wip: add regression tests for vision benchmark artifacts

tests/test_vision_benchmark_artifacts.py

@@ -0,0 +1,21 @@
+import json
+from pathlib import Path
+
+
+DATASET = Path("benchmarks/test_images.json")
+REPORT = Path("metrics/vision-benchmark-smoke-2026-04-22.md")
+
+
+def test_benchmark_dataset_is_issue_sized_and_category_complete() -> None:
+    items = json.loads(DATASET.read_text(encoding="utf-8"))
+    assert len(items) >= 50
+    categories = {item["category"] for item in items}
+    assert {"screenshot", "diagram", "photo", "ocr", "chart", "document"}.issubset(categories)
+
+
+def test_metrics_report_exists_with_recommendation() -> None:
+    assert REPORT.exists(), "missing benchmark report under metrics/"
+    text = REPORT.read_text(encoding="utf-8")
+    assert "Recommendation" in text
+    assert "Gemma 4" in text
+    assert "Gemini" in text