feat: build local skills registry

skills/offer-writing.md

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+# Offer Writing
+
+Use this guide when producing outreach-ready offer text.
+
+- Translate findings into 1–2 concrete pain-result pairings.
+- Keep scope, deliverables, and next step explicit.
+- Tie price framing to measurable benefit and timeline.
+- Use transparent language and avoid inflated promises.
+- Return a compact offer draft and optional follow-up variant.