Add September 2025 meetup agenda slide (#15)

* Add September 2025 meetup agenda slide

Copy August 2025 agenda content to create new September slide file and update App.tsx to include it in the presentation.

Closes #14

Co-authored-by: Kevin Kipp <third774@users.noreply.github.com>

* Update talks

---------

Co-authored-by: claude[bot] <209825114+claude[bot]@users.noreply.github.com>
Co-authored-by: Kevin Kipp <third774@users.noreply.github.com>

Author: third774

src/App.tsx

@@ -6,6 +6,7 @@ import "reveal.js/dist/reveal.css";
 import "./styles/index.scss";
 import Splash from "./slides/splash";
 import Agenda202508 from "./slides/agenda-2025-08";
+import Agenda202509 from "./slides/agenda-2025-09";
 import Thanks from "./slides/thanks";
 
 function App() {
@@ -47,6 +48,7 @@ function App() {
       <div className="slides">
         <Splash />
         <Agenda202508 />
+        <Agenda202509 />
         <Thanks />
       </div>
     </div>

src/slides/agenda-2025-09.tsx

@@ -0,0 +1,23 @@
+const Agenda202509 = () => {
+  return (
+    <section>
+      <div className="agendaWrapper">
+        <div className="agenda">
+          <h2>Agenda</h2>
+          <ol>
+            <li>Welcome!</li>
+            <li>Shirts!</li>
+            <li>⚡️ Angular AI Tutor</li>
+            <li>
+              🎤 Orthogonality and Redundancy (Service layers with EffectTS)
+            </li>
+            <li>Wrap up</li>
+          </ol>
+        </div>
+      </div>
+    </section>
+  );
+};
+
+export default Agenda202509;
+