impeccable-25-rule-deterministic-design-linter

The impeccable npm package provides a 3,590-line JS detection engine with 25 design anti-pattern rules (13 AI-slop tells, 12 general quality) that run at zero LLM cost. Wire as PostToolUse hook: after Write/Edit to .html/.css/.tsx/.jsx/.svelte/.astro files, run npx impeccable detect --json <file> to surface violations inline. This provides deterministic quality enforcement that LLMs cannot replicate reliably.