Opus 5.5 One shot the launch video of a feature redesign

I've been working on a redesign of the condition markers in fynk, the contract management tool we build. Conditions decide whether a clause ends up in a contract, and the old markers got noisy fast: hatched stripes on every conditional block, markers stacked on markers, and nothing telling you why a clause was hidden. While I was finishing it, I had the idea to make a launch video for it, like the ones SaaS companies post on X. So I asked Claude Code to make one. No video editor involved. The whole video is code: \- One HTML page with a GSAP timeline, rendered frame by frame in headless Chrome with Playwright, then encoded with ffmpeg. That's 3,600 frames at 1080p60, and a full render takes under a minute across 8 browsers. \- The product UI is real, not a mockup. It captured the editor from my local dev server and rebuilt the old design from the pre-redesign CSS in our git history. \- The voiceover is ElevenLabs eleven\_v3. The API returns a timestamp for every character,…