feat: build local skills registry

skills/copy-clarity.md

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+# Copy Clarity
+
+Use this file for headline/body copy improvements.
+
+- Replace jargon with clear benefit language.
+- Tighten sentences to one core message per paragraph.
+- Keep benefit first, proof second, next step third.
+- Preserve the requested tone and avoid overpromising.
+- Output a concise before/after improvement set.