docs(changelog): add harness and diff view updates

src/pages/changelog.astro

@@ -53,6 +53,7 @@ import BaseLayout from '../layouts/BaseLayout.astro';
                 <li>Replaced a select few commands with built-in commands for better cross-OS compatibility.</li>
                 <li><strong>Zaguán Blade.</strong> Disabled a lot more debug output throughout the app.</li>
                 <li><strong>Zaguán Coder Daemon.</strong> Made the <code>symbol_*</code> tools first-class citizens.</li>
+                <li><strong>Harness.</strong> Continued strengthening the harness across many levels. Testing is still needed.</li>
               </ul>
             </div>
 
@@ -67,6 +68,7 @@ import BaseLayout from '../layouts/BaseLayout.astro';
                 <li><strong>Chat Panel.</strong> Fixed Markdown rendering so messages feel more fluid and natural.</li>
                 <li><strong>Chat Input.</strong> Fixed a bug where the cursor was rendered at double the font size.</li>
                 <li><strong>Editor.</strong> Fixed the font color of inactive line numbers in the gutter to be brighter and more visible.</li>
+                <li><strong>Diff View.</strong> Fixed a regression in the editor Diff View.</li>
               </ul>
             </div>
           </div>