feat: add Remotion video project + SquareMCP brand compositions

- Scaffold videos/remotion-demo with Remotion 4.0.459
- SquareMCPLinkedIn: 90s 1080×1080 LinkedIn explainer (6 scenes, spring animations)
- SquareMCPHeroLoop: 30s 1920×1080 seamless hero loop (node network + MCP layer + logo)
- Brand tokens from squaremcp-logo.svg (#0E63F6/#7DB6FF), Inter via @remotion/google-fonts
- Both compositions rendered to out/ and type-checked clean
- Update .gitignore to exclude videos/remotion-demo/node_modules and out/

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

videos/remotion-demo/remotion.config.ts

@@ -0,0 +1,13 @@
+/**
+ * Note: When using the Node.JS APIs, the config file
+ * doesn't apply. Instead, pass options directly to the APIs.
+ *
+ * All configuration options: https://remotion.dev/docs/config
+ */
+
+import { Config } from "@remotion/cli/config";
+import { enableTailwind } from '@remotion/tailwind-v4';
+
+Config.setVideoImageFormat("jpeg");
+Config.setOverwriteOutput(true);
+Config.overrideWebpackConfig(enableTailwind);