Drives the editor's built-in tour (?mode=tour, fully mocked — no backend/models/
GPU) with Playwright: serves the static frontend, walks window.TourGuide, and
screenshots each step (annotated with its spotlight + caption) while recording a
walkthrough video. Emits NN-*.png stills, an index.md gallery, and
walkthrough.webm/.mp4. Self-maintaining: new tour steps appear automatically.
No more screenshotting each button by hand. node_modules/ and out/ are gitignored.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
