chore(skills): prune marketing catalog

shared/skills/cro/SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: cro
-description: "When the user wants to optimize, improve, or increase conversions on any marketing page or form — including homepage, landing pages, pricing pages, feature pages, lead capture forms, or contact forms. Also use when the user says 'CRO,' 'conversion rate optimization,' 'this page isn't converting,' 'improve conversions,' 'why isn't this page working,' 'my landing page sucks,' 'form abandonment,' 'nobody's converting,' 'low conversion rate,' or 'this page needs work.' Use this even if the user just shares a URL and asks for feedback. For signup/registration flows, see signup. For post-signup activation, see onboarding. For popups/modals, see popups."
+description: Use when improving product or website pages and forms so visitors understand the value and complete intended actions.
 metadata:
   version: 2.0.0
 ---
@@ -175,10 +175,7 @@ When recommending experiments, consider tests for:
 
 ## Related Skills
 
-- **signup**: If the issue is in the signup process itself
-- **popups**: If considering popups as part of the strategy
 - **copywriting**: If the page needs a complete copy rewrite
-- **ab-testing**: To properly test recommended changes
 
 ---