feat(remotion): mortgage broker demo video for Alex Ferrari

- Add SquareMCPBrokerDemo composition (1920x1080, 45s)
- 5 scenes: title, email inbox (47 unread → 5 replies), rate blast (200 prospects),
  WhatsApp auto-response, Facebook page reply
- Outro: SquareMCP logo + tagline
- Uses existing brand colors and spring animations

videos/remotion-demo/src/Root.tsx

@@ -3,6 +3,7 @@ import { Composition } from "remotion";
 import { SquareMCPLinkedIn } from "./SquareMCPLinkedIn";
 import { SquareMCPHeroLoop } from "./SquareMCPHeroLoop";
 import { YCAppVideo } from "./YCAppVideo";
+import { SquareMCPBrokerDemo } from "./SquareMCPBrokerDemo";
 import {
   SquareMCPTikTokCTA,
   SquareMCPTikTokDemo,
@@ -105,6 +106,14 @@ export const RemotionRoot = () => {
         width={1920}
         height={1080}
       />
+      <Composition
+        id="SquareMCPBrokerDemo"
+        component={SquareMCPBrokerDemo}
+        durationInFrames={45 * 30}
+        fps={30}
+        width={1920}
+        height={1080}
+      />
     </>
   );
 };