cleanup: register HeroTitle composition, harden gitignore

Add HeroTitle Remotion composition (used for documentary title cards).
Gitignore now covers youtube tokens, stray pexels downloads, and
scratch dirs. Removed leftover test media and credential files.

remotion-composer/src/Root.tsx

@@ -11,6 +11,7 @@ import {
   calculateTitledVideoMetadata,
 } from "./TitledVideo";
 import { EndTag, EndTagProps } from "./components/EndTag";
+import { HeroTitle } from "./components/HeroTitle";
 
 // ---------------------------------------------------------------------------
 // Theme System — prevents every video from looking like dark fintech
@@ -204,6 +205,18 @@ export const Root: React.FC = () => {
         }}
         calculateMetadata={calculateTitledVideoMetadata}
       />
+      <Composition
+        id="HeroTitle"
+        component={HeroTitle}
+        durationInFrames={30 * 17}
+        fps={30}
+        width={1920}
+        height={1080}
+        defaultProps={{
+          title: "THE CALIBRATORS",
+          subtitle: "The People Who Define Reality",
+        }}
+      />
       <Composition
         id="EndTag"
         component={EndTag}