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_check_placeholders.js

@@ -0,0 +1,89 @@
+const { chromium } = require('playwright');
+
+const input = process.argv[2];
+const presenterNames = ['Zhihao Zhao', 'Zipeng Wang', 'Jiuqi Feng', 'Siyuan Zhang'];
+
+function baseWithoutHash(url) {
+  const hashIndex = url.indexOf('#');
+  return hashIndex >= 0 ? url.slice(0, hashIndex) : url;
+}
+
+async function applyRequestedEdits(page) {
+  await page.evaluate((names) => {
+    const visible = Array.from(document.querySelectorAll('section')).find((section) => {
+      const style = getComputedStyle(section);
+      return style.visibility !== 'hidden' && style.opacity !== '0';
+    });
+    if (!visible) return;
+
+    if ((visible.getAttribute('data-label') || '').startsWith('01')) {
+      for (const el of Array.from(visible.querySelectorAll('div'))) {
+        const text = (el.innerText || '').replace(/\s+/g, ' ').trim();
+        if (text === 'PRESENTED [ Presentation Date ] 4-person team walkthrough · ~10 min') {
+          el.style.display = 'none';
+        }
+      }
+    }
+
+    if ((visible.getAttribute('data-label') || '').startsWith('15')) {
+      const placeholders = Array.from(visible.querySelectorAll('div'))
+        .filter((el) => (el.innerText || '').trim() === '[ name ]');
+      placeholders.forEach((el, index) => {
+        if (names[index]) {
+          el.textContent = names[index];
+        }
+      });
+    }
+  }, presenterNames);
+}
+
+(async () => {
+  if (!input) {
+    throw new Error('Usage: node html_to_ppt_check_placeholders.js <file-url>');
+  }
+
+  const launchOptions = { headless: true };
+  if (process.env.BROWSER_EXE) {
+    launchOptions.executablePath = process.env.BROWSER_EXE;
+  }
+
+  const browser = await chromium.launch(launchOptions);
+  const baseUrl = baseWithoutHash(input);
+  const findings = [];
+  const nameChecks = [];
+
+  for (let i = 1; i <= 15; i += 1) {
+    const page = await browser.newPage({ viewport: { width: 1920, height: 1080 } });
+    await page.goto(`${baseUrl}#${i}`, { waitUntil: 'load', timeout: 30000 });
+    await page.waitForSelector('section', { state: 'attached', timeout: 10000 });
+    await page.waitForTimeout(500);
+    await applyRequestedEdits(page);
+    const result = await page.evaluate((names) => {
+      const visible = Array.from(document.querySelectorAll('section')).find((section) => {
+        const style = getComputedStyle(section);
+        return style.visibility !== 'hidden' && style.opacity !== '0';
+      });
+      const label = visible?.getAttribute('data-label') || '';
+      const text = visible?.innerText || '';
+      const placeholderMatches = text.match(/\[[^\]]+\]|Presentation Date|Slide Number|placeholder|PRESENTED\s+\[/gi) || [];
+      return {
+        label,
+        placeholderMatches,
+        presenterNamesPresent: names.map((name) => text.includes(name)),
+      };
+    }, presenterNames);
+    if (result.placeholderMatches.length) {
+      findings.push({ slide: i, label: result.label, matches: result.placeholderMatches });
+    }
+    if (i === 15) {
+      nameChecks.push(...result.presenterNamesPresent);
+    }
+    await page.close();
+  }
+
+  await browser.close();
+  console.log(JSON.stringify({ findings, slide15NamesPresent: nameChecks }, null, 2));
+})().catch((err) => {
+  console.error(err);
+  process.exit(1);
+});