Turning every correction into a rule in BRIEF.md is the part I'd copy first. Two rules that fit mistake 7 and the codebase access. For leaks, the agent can run OCR over sampled frames of the final file and fail the render if the test site's domain or a test account email shows up, which catches what a quick watch misses. And because the script quotes real labels like "Tap Buy Ticket" straight from the code, those quoted strings double as a checklist later: when a release renames a button, looking up the old label across the saved scripts tells you which how-to videos now show something users won't find.