diff --git a/.agents/scripts/rendered-text-diff.mjs b/.agents/scripts/rendered-text-diff.mjs
new file mode 100644
index 0000000..1d5a88e
--- /dev/null
+++ b/.agents/scripts/rendered-text-diff.mjs
@@ -0,0 +1,92 @@
+#!/usr/bin/env node
+// Compare the *rendered* text of a legacy page against its Astro replacement.
+//
+//   node .agents/scripts/rendered-text-diff.mjs full-guide
+//
+// Why this exists: scripts/verify.mjs reads the legacy files, so a migrated
+// page can drop half its content and still pass the gate. Task 15d shipped
+// /full-guide/ missing 86 rendered spans -- the entire verification section,
+// the hands-on exercise brief, and both "Clone from Gitea" links -- and every
+// check was green.
+//
+// Static HTML comparison is useless here: the guide's tab panels are injected
+// by an island at runtime, so half the legacy page's markup has no static
+// counterpart. This walks the live DOM instead and skips anything the browser
+// is not painting -- which also drops the hidden Portuguese half of each
+// bilingual pair, so the two sides line up.
+//
+// Requires playwright (devDependency) and two static servers; it starts both.
+import { spawn } from 'node:child_process';
+import { cpSync, mkdtempSync, rmSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { chromium } from 'playwright';
+
+const route = process.argv[2];
+if (!route) {
+  console.error('usage: rendered-text-diff.mjs <route>   e.g. full-guide');
+  process.exit(2);
+}
+
+// The built site expects to be served under the configured base path.
+const staging = mkdtempSync(join(tmpdir(), 'af-rtd-'));
+cpSync('dist', join(staging, 'ai-for-dummies'), { recursive: true });
+
+const serve = (dir, port) =>
+  spawn('python3', ['-m', 'http.server', String(port), '-d', dir], { stdio: 'ignore' });
+const servers = [serve('.', 4197), serve(staging, 4196)];
+const stop = () => {
+  servers.forEach((s) => s.kill());
+  rmSync(staging, { recursive: true, force: true });
+};
+
+// Visible text nodes, in document order, whitespace collapsed.
+const visibleText = () => {
+  const out = [];
+  const walk = (node) => {
+    for (const child of node.childNodes) {
+      if (child.nodeType === Node.TEXT_NODE) {
+        const text = child.textContent.replace(/\s+/g, ' ').trim();
+        if (text) out.push(text);
+        continue;
+      }
+      if (child.nodeType !== Node.ELEMENT_NODE) continue;
+      if (child.tagName === 'SCRIPT' || child.tagName === 'STYLE') continue;
+      const style = getComputedStyle(child);
+      if (child.hidden || style.display === 'none' || style.visibility === 'hidden') continue;
+      walk(child);
+    }
+  };
+  walk(document.body);
+  return out;
+};
+
+try {
+  await new Promise((r) => setTimeout(r, 1500));
+  const browser = await chromium.launch();
+  const grab = async (url) => {
+    const page = await browser.newPage({ viewport: { width: 1400, height: 1000 } });
+    await page.goto(url, { waitUntil: 'load' });
+    // The islands hydrate and render their initial panel on load; without this
+    // every panel's copy reads as missing.
+    await page.waitForTimeout(1200);
+    const spans = await page.evaluate(visibleText);
+    await page.close();
+    return spans;
+  };
+
+  const legacy = await grab(`http://localhost:4197/${route}/index.html`);
+  const astro = await grab(`http://localhost:4196/ai-for-dummies/${route}/`);
+  await browser.close();
+
+  const rendered = new Set(astro);
+  const missing = legacy.filter((span) => !rendered.has(span));
+
+  console.log(
+    `legacy ${legacy.length} spans · astro ${astro.length} spans · missing ${missing.length}`,
+  );
+  for (const span of missing) console.log(`  - ${span}`);
+  process.exitCode = missing.length === 0 ? 0 : 1;
+} finally {
+  stop();
+}
diff --git a/src/pages/full-guide.astro b/src/pages/full-guide.astro
index e133917..6c43689 100644
--- a/src/pages/full-guide.astro
+++ b/src/pages/full-guide.astro
@@ -1064,6 +1064,22 @@ const base = import.meta.env.BASE_URL;
         >
       </p>
     </section>
+    <!-- Legacy full-guide/index.html closes with this section after `.sources`.
+         Task 15d dropped it, and nothing caught that: verify.mjs reads the
+         legacy file, so its chapter-route assertion kept passing. It has no
+         `translations.pt` entry, so it is English-only on the live site too. -->
+    <section class="chapter-route">
+      <div class="section-label">
+        <span>Navigate by idea</span><span>short chapters / one system</span>
+      </div>
+      <p>
+        Prefer a focused chapter? Start with the <a href={`${base}summary/`}>route map</a>, then
+        jump directly to <a href={`${base}models/`}>models</a>, <a href={`${base}agents/`}
+          >agents and worktrees</a
+        >, <a href={`${base}skills/`}>skill creation</a>, <a href={`${base}rules/`}>rules</a>, or
+        the <a href={`${base}skills-review/`}>skills review desk</a>.
+      </p>
+    </section>
   </main>
   <GuideSelector rootSelector="#full-guide" data={selectorData} />
 </BaseLayout>