feat: Update local agent documentation to reflect changes in user_id and session_id handling; add marketing strategy document; update skills-lock.json with new Remotion best practices; update website subproject commit.

.claude/skills/remotion-best-practices/rules/get-audio-duration.md

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+---
+name: get-audio-duration
+description: Getting the duration of an audio file in seconds with Mediabunny
+metadata:
+  tags: duration, audio, length, time, seconds, mp3, wav
+---
+
+# Getting audio duration with Mediabunny
+
+Mediabunny can extract the duration of an audio file. It works in browser, Node.js, and Bun environments.
+
+## Getting audio duration
+
+```tsx title="get-audio-duration.ts"
+import { Input, ALL_FORMATS, UrlSource } from "mediabunny";
+
+export const getAudioDuration = async (src: string) => {
+  const input = new Input({
+    formats: ALL_FORMATS,
+    source: new UrlSource(src, {
+      getRetryDelay: () => null,
+    }),
+  });
+
+  const durationInSeconds = await input.computeDuration();
+  return durationInSeconds;
+};
+```
+
+## Usage
+
+```tsx
+const duration = await getAudioDuration("https://remotion.media/audio.mp3");
+console.log(duration); // e.g. 180.5 (seconds)
+```
+
+## Using with staticFile in Remotion
+
+Make sure to wrap the file path in `staticFile()`:
+
+```tsx
+import { staticFile } from "remotion";
+
+const duration = await getAudioDuration(staticFile("audio.mp3"));
+```
+
+## In Node.js and Bun
+
+Use `FileSource` instead of `UrlSource`:
+
+```tsx
+import { Input, ALL_FORMATS, FileSource } from "mediabunny";
+
+const input = new Input({
+  formats: ALL_FORMATS,
+  source: new FileSource(file), // File object from input or drag-drop
+});
+```