feat: build local skills registry

skills/design-audit.md

@@ -0,0 +1,9 @@
+# Design Audit
+
+Use this file as the concrete operating guide for design-oriented analysis.
+
+- Check visual hierarchy and above-the-fold clarity.
+- Validate CTA prominence, spacing, and action visibility.
+- Flag inconsistent components, mismatched states, and weak contrast.
+- Verify tone alignment between typography, imagery, and brand intent.
+- Prioritize 3–5 actionable fixes by expected conversion impact.