impeccable-repo-25-rule-deterministic-design-scanner

The impeccable GitHub repo (pbakaus/impeccable) contains a 3,590-line JS detection engine with 25 rules split into 13 AI-slop tells (Inter/default fonts, purple-blue gradients, bounce easing, glassmorphism, pill badges, etc.) and 12 general quality rules (contrast violations, orphaned text, z-index chaos, etc.). It runs zero-LLM-cost via npx impeccable detect --json <file> and can be wired as a PostToolUse hook on Write/Edit to .html/.css/.tsx/.jsx files. This fills a gap our entire frontend stack has — all current quality assessment is LLM-based with no deterministic scanning.

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