fix: resolve merge conflicts with main after ai-seo merge

Both ai-seo and churn-prevention updated marketplace.json and
VERSIONS.md. Merged both entries, bumped skill count to 29.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -12,12 +12,13 @@
   "plugins": [
     {
       "name": "marketing-skills",
-      "description": "28 marketing skills for technical marketers and founders: CRO, copywriting, cold email, SEO, paid ads, ad creative, churn prevention, pricing strategy, referral programs, and more",
+      "description": "29 marketing skills for technical marketers and founders: CRO, copywriting, cold email, SEO, AI SEO, paid ads, ad creative, churn prevention, pricing strategy, referral programs, and more",
       "source": "./",
       "strict": false,
       "skills": [
         "./skills/ab-test-setup",
         "./skills/ad-creative",
+        "./skills/ai-seo",
         "./skills/analytics-tracking",
         "./skills/churn-prevention",
         "./skills/cold-email",