Merge PR #232: add directory-submissions skill

Resolves marketplace.json conflict (strips ./ prefix, adds directory-submissions, updates count to 37).

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

.claude-plugin/marketplace.json

@@ -12,7 +12,7 @@
   "plugins": [
     {
       "name": "marketing-skills",
-      "description": "36 marketing skills for technical marketers and founders: ASO, CRO, copywriting, cold email, SEO, AI SEO, paid ads, ad creative, churn prevention, pricing strategy, referral programs, revenue operations, sales enablement, customer research, site architecture, and more",
+      "description": "37 marketing skills for technical marketers and founders: ASO, CRO, copywriting, cold email, SEO, AI SEO, paid ads, ad creative, churn prevention, pricing strategy, referral programs, revenue operations, sales enablement, customer research, site architecture, and more",
       "source": ".",
       "strict": false,
       "skills": [
@@ -29,6 +29,7 @@
         "skills/copy-editing",
         "skills/copywriting",
         "skills/customer-research",
+        "skills/directory-submissions",
         "skills/email-sequence",
         "skills/form-cro",
         "skills/free-tool-strategy",