docs(www): add v3.0.0-beta.20 to changelog and homepage

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

Author: lane711

www/src/app/changelog/page.mdx

@@ -99,6 +99,30 @@ export const sections = [
 
 
 
+{/* Version 3.0.0-beta.20 */}
+<div className="relative pl-8 pb-8 border-l-2 border-emerald-200 dark:border-emerald-800">
+  <div className="absolute -left-3 top-0 w-6 h-6 rounded-full bg-emerald-500 border-4 border-white dark:border-gray-900 shadow-lg"></div>
+
+  <div className="bg-gradient-to-br from-emerald-50 to-teal-50 dark:from-emerald-900/20 dark:to-teal-900/20 rounded-xl p-6 border border-emerald-200 dark:border-emerald-800 shadow-md hover:shadow-xl transition-shadow">
+    <div className="flex items-center gap-3 mb-4">
+      <span className="px-3 py-1 bg-emerald-500 text-white text-sm font-bold rounded-lg">v3.0.0-beta.20</span>
+      <span className="text-sm text-gray-600 dark:text-gray-400">June 30, 2026</span>
+      <span className="px-2 py-1 bg-gradient-to-r from-orange-100 to-red-100 dark:from-orange-900/30 dark:to-red-900/30 border border-orange-300 dark:border-orange-700 text-orange-800 dark:text-orange-300 text-xs font-bold rounded uppercase">Latest</span>
+    </div>
+
+    <div className="space-y-3">
+      <div>
+        <h4 className="text-sm font-bold text-emerald-800 dark:text-emerald-300 mb-2 flex items-center gap-2">
+          <span>✨</span> Highlights
+        </h4>
+        <ul className="space-y-1.5 ml-6 text-sm text-gray-700 dark:text-gray-300">
+          <li className="flex items-start gap-2"><span className="text-emerald-500">▸</span><strong>feat(scripts)</strong>: New <code>npm run update:plugin</code> command — pulls latest bundled plugin files from GitHub main, giving existing apps bug fixes without a fresh scaffold</li>
+        </ul>
+      </div>
+    </div>
+  </div>
+</div>
+
 {/* Version 3.0.0-beta.19 */}
 <div className="relative pl-8 pb-8 border-l-2 border-emerald-200 dark:border-emerald-800">
   <div className="absolute -left-3 top-0 w-6 h-6 rounded-full bg-emerald-500 border-4 border-white dark:border-gray-900 shadow-lg"></div>
@@ -107,7 +131,6 @@ export const sections = [
     <div className="flex items-center gap-3 mb-4">
       <span className="px-3 py-1 bg-emerald-500 text-white text-sm font-bold rounded-lg">v3.0.0-beta.19</span>
       <span className="text-sm text-gray-600 dark:text-gray-400">June 30, 2026</span>
-      
     </div>
 
     <div className="space-y-3">
@@ -460,7 +483,6 @@ export const sections = [
     <div className="flex items-center gap-3 mb-4">
       <span className="px-3 py-1 bg-emerald-500 text-white text-sm font-bold rounded-lg">v3.0.0-beta.19</span>
       <span className="text-sm text-gray-600 dark:text-gray-400">June 29, 2026</span>
-      <span className="px-2 py-1 bg-gradient-to-r from-orange-100 to-red-100 dark:from-orange-900/30 dark:to-red-900/30 border border-orange-300 dark:border-orange-700 text-orange-800 dark:text-orange-300 text-xs font-bold rounded uppercase">Latest</span>
     </div>
 
     <div className="space-y-3">

www/src/app/page.mdx

@@ -515,29 +515,25 @@ Join thousands of developers building the future of web APIs
       </div>
     </div>
 
-    {/* v3.0.0-beta.19 */}
+    {/* v3.0.0-beta.20 */}
     <div className="border-l-4 border-emerald-500 dark:border-emerald-400 pl-4 py-1">
       <div className="flex items-center gap-2 mb-2">
-        <span className="text-xs font-bold px-2 py-1 rounded bg-emerald-100 dark:bg-emerald-900/30 text-emerald-700 dark:text-emerald-300">v3.0.0-beta.19</span>
+        <span className="text-xs font-bold px-2 py-1 rounded bg-emerald-100 dark:bg-emerald-900/30 text-emerald-700 dark:text-emerald-300">v3.0.0-beta.20</span>
         <span className="text-xs px-2 py-1 rounded bg-gradient-to-r from-orange-100 to-red-100 dark:from-orange-900/30 dark:to-red-900/30 border border-orange-300 dark:border-orange-700 text-orange-800 dark:text-orange-300 font-bold">LATEST</span>
         <span className="text-sm text-gray-500 dark:text-gray-400">2026-06-30</span>
       </div>
       <div className="text-sm space-y-1">
         <div className="flex items-start gap-2">
           <span className="text-emerald-600 dark:text-emerald-400 mt-0.5">✓</span>
-          <span className="text-gray-700 dark:text-gray-300">**fix(plugins)**: Example plugin settings updated via admin UI now reflect immediately in `GET /example` API responses — no Worker restart required (PR #975)</span>
-        </div>
-        <div className="flex items-start gap-2">
-          <span className="text-emerald-600 dark:text-emerald-400 mt-0.5">✓</span>
-          <span className="text-gray-700 dark:text-gray-300">**fix(plugins)**: `greeting` configSchema field is now used in API response message (was previously hardcoded); example plugin bumped to v1.0.1</span>
+          <span className="text-gray-700 dark:text-gray-300">**feat(scripts)**: New `npm run update:plugin` command — pull latest bundled plugin files from GitHub without scaffolding a new project</span>
         </div>
       </div>
     </div>
 
+    {/* v3.0.0-beta.19 */}
     <div className="border-l-4 border-blue-500 dark:border-blue-400 pl-4 py-1">
       <div className="flex items-center gap-2 mb-2">
         <span className="text-xs font-bold px-2 py-1 rounded bg-blue-100 dark:bg-blue-900/30 text-blue-700 dark:text-blue-300">v3.0.0-beta.19</span>
-        
         <span className="text-sm text-gray-500 dark:text-gray-400">2026-06-30</span>
       </div>
       <div className="text-sm space-y-1">