feat: add revops and sales-enablement skills

Fill the revenue operations and internal sales collateral gaps in the
marketing skills collection. revops covers lead lifecycle, scoring,
routing, pipeline management, and CRM automation. sales-enablement
covers pitch decks, one-pagers, objection handling, demo scripts, and
sales playbooks. Cross-references added to 6 existing skills.

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

.claude-plugin/marketplace.json

@@ -12,7 +12,7 @@
   "plugins": [
     {
       "name": "marketing-skills",
-      "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",
+      "description": "31 marketing skills for technical marketers and founders: CRO, copywriting, cold email, SEO, AI SEO, paid ads, ad creative, churn prevention, pricing strategy, referral programs, revenue operations, sales enablement, and more",
       "source": "./",
       "strict": false,
       "skills": [
@@ -41,6 +41,8 @@
         "./skills/product-marketing-context",
         "./skills/programmatic-seo",
         "./skills/referral-program",
+        "./skills/revops",
+        "./skills/sales-enablement",
         "./skills/schema-markup",
         "./skills/seo-audit",
         "./skills/signup-flow-cro",