Copy: state the AI-free stance as a confidentiality benefit; record the exploration

src/app/components/AboutModal.tsx

@@ -4,7 +4,7 @@
  * Rendered inside ModalShell — no backdrop, close button, or focus trap here;
  * the shell owns all of that (docs/architecture/03 → Layer 3). This component
  * is pure content: app identity, keyboard shortcuts (§01D), privacy posture
- * (SOUL.md — local-only, no accounts, no telemetry), and acknowledgements of
+ * (SOUL.md — local-only, no accounts, no telemetry, no AI), and acknowledgements of
  * the projects Astrolabe is built on and shaped by.
  */
 
@@ -74,10 +74,15 @@ export function AboutModal() {
         <h3 className={styles.heading}>Privacy</h3>
         <p className={styles.body}>
           Astrolabe runs in your browser. Your snippets, datasets, and settings are stored locally
-          on your device — there&rsquo;s no server to send them to.
+          on your device — there&rsquo;s no server to send them to. Work that has to stay
+          confidential is safe here.
         </p>
         <ul className={styles.list}>
           <li>No account or sign-in.</li>
+          <li>
+            No AI. No model authors, edits, or critiques your charts, and nothing is sent to one.
+            The chart builder&rsquo;s suggestions are computed locally from your data.
+          </li>
           <li>
             The app itself runs no analytics or tracking. Its host (Cloudflare) records standard,
             aggregate traffic like any web server — not your library or the charts you build, which