feat: build local skills registry

skills/marketing-positioning.md

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+# Marketing Positioning
+
+Use this file to sharpen market message and differentiation.
+
+- Define one-liner positioning for the target segment.
+- List the top 3 differentiators vs local alternatives.
+- Connect positioning to pain points and decision criteria.
+- Keep claims evidence-backed from website and audit findings.
+- Produce a short positioning paragraph for outreach and landing intro.