Builds a per-PR visual-diff summary that clusters intentional vs incidental changes across snapshots emitted by Percy, Chromatic, Playwright `toHaveScreenshot`, Storybook test-runner, and other visual testing tools - groups diffs by component / route, separates "intent-aligned with PR scope" from "cascade / regression suspect", surfaces baseline-update recommendations, and emits a single PR comment that points the reviewer at the screenshots that need actual eyes. Use when a PR has 20+ visual diffs and the reviewer needs help triaging which ones to actually open.