feat: Module C v5/v6 training complete, ablations, SOTA baselines, paper updates

- Module C: BC+PPO training v5/v6 done; eval results in experiments/eval_intervention_v{5,6}.json
- Reward: v5 label-aligned constrained reward (code/src/rl/reward.py)
- Ablations: Module B (history_r, response_only, full) + Module C (wo_category_reward)
- SOTA baselines: WildGuard and ShieldGemma2b eval scripts and results
- Paper: update sections 05–08 (Module B/C description, experiments table, discussion)
- Docs: add record.md (change log), update state.md and exp.md; retire change.md
- Tools: add html-to-ppt utilities and run_shieldgemma2b.sh
- Configs: add ablation YAML configs for Module B and C
- Cleanup: remove stale reference/ PNG screenshots

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tools/html_to_ppt_make.py

@@ -0,0 +1,68 @@
+import json
+import sys
+from pathlib import Path
+
+from PIL import Image, ImageOps
+from pptx import Presentation
+from pptx.util import Inches
+
+
+def main() -> None:
+    if len(sys.argv) != 3:
+        raise SystemExit("Usage: python html_to_ppt_make.py <image-dir> <output-pptx>")
+
+    image_dir = Path(sys.argv[1])
+    output_pptx = Path(sys.argv[2])
+    output_pptx.parent.mkdir(parents=True, exist_ok=True)
+
+    labels_path = image_dir / "slides.json"
+    labels = {}
+    if labels_path.exists():
+        labels = {item["index"]: item["label"] for item in json.loads(labels_path.read_text(encoding="utf-8"))}
+
+    image_paths = sorted(image_dir.glob("slide_*.png"))
+    if not image_paths:
+        raise SystemExit(f"No slide PNGs found in {image_dir}")
+
+    prs = Presentation()
+    prs.slide_width = Inches(13.333333)
+    prs.slide_height = Inches(7.5)
+
+    blank_layout = prs.slide_layouts[6]
+    for image_path in image_paths:
+        slide_num = int(image_path.stem.split("_")[-1])
+        slide = prs.slides.add_slide(blank_layout)
+        picture = slide.shapes.add_picture(
+            str(image_path),
+            0,
+            0,
+            width=prs.slide_width,
+            height=prs.slide_height,
+        )
+        picture.name = labels.get(slide_num, image_path.stem)
+
+    prs.save(output_pptx)
+
+    montage_path = output_pptx.with_suffix(".preview.png")
+    thumbs = []
+    for image_path in image_paths:
+        img = Image.open(image_path).convert("RGB")
+        img.thumbnail((384, 216), Image.Resampling.LANCZOS)
+        thumbs.append(ImageOps.expand(img, border=2, fill=(30, 30, 30)))
+
+    cols = 5
+    rows = (len(thumbs) + cols - 1) // cols
+    montage = Image.new("RGB", (cols * 388, rows * 220), (12, 15, 24))
+    for idx, thumb in enumerate(thumbs):
+        x = (idx % cols) * 388
+        y = (idx // cols) * 220
+        montage.paste(thumb, (x, y))
+    montage.save(montage_path)
+
+    print(f"pptx={output_pptx}")
+    print(f"preview={montage_path}")
+    print(f"slides={len(image_paths)}")
+
+
+if __name__ == "__main__":
+    main()