test: end-to-end smoke test with visual output

tests/test_e2e.py

@@ -0,0 +1,31 @@
+from pathlib import Path
+
+from PIL import Image
+
+from unredact.pipeline.rasterize import rasterize_pdf
+from unredact.pipeline.ocr import ocr_page
+from unredact.pipeline.font_detect import detect_font
+from unredact.pipeline.overlay import render_overlay
+
+
+def test_full_pipeline_produces_overlay(sample_pdf: Path):
+    """Run the full pipeline and save output for visual inspection."""
+    pages = rasterize_pdf(sample_pdf)
+    output_dir = Path("/tmp/unredact_test_output")
+    output_dir.mkdir(exist_ok=True)
+
+    for i, page in enumerate(pages, start=1):
+        lines = ocr_page(page)
+        font_match = detect_font(lines, page)
+        overlay = render_overlay(page, lines, font_match)
+
+        # Save for visual inspection
+        overlay.convert("RGB").save(output_dir / f"page_{i}_overlay.png")
+        page.save(output_dir / f"page_{i}_original.png")
+
+        print(f"Page {i}: font={font_match.font_name} "
+              f"size={font_match.font_size}px "
+              f"score={font_match.score:.1f} "
+              f"lines={len(lines)}")
+
+    print(f"\nSaved to {output_dir}/ — open the overlay PNGs to visually check alignment.")