chore(skills): prune marketing catalog

shared/skills/copy-editing/SKILL.md

@@ -1,6 +1,6 @@
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 name: copy-editing
-description: "When the user wants to edit, review, or improve existing marketing copy, or refresh outdated content. Also use when the user mentions 'edit this copy,' 'review my copy,' 'copy feedback,' 'proofread,' 'polish this,' 'make this better,' 'copy sweep,' 'tighten this up,' 'this reads awkwardly,' 'clean up this text,' 'too wordy,' 'sharpen the messaging,' 'refresh this content,' 'update this page,' 'this content is outdated,' or 'content audit.' Use this when the user already has copy and wants it improved or refreshed rather than rewritten from scratch. For writing new copy, see copywriting."
+description: Use when editing existing website, product, or documentation text for clarity, tone, structure, and persuasiveness. For new copy, see copywriting.
 metadata:
   version: 2.0.0
 ---
@@ -443,7 +443,6 @@ Copy editing isn't just for new content. Existing pages decay over time — outd
 - **copywriting**: For writing new copy from scratch (use this skill to edit after your first draft is complete)
 - **cro**: For broader page optimization beyond copy
 - **marketing-psychology**: For understanding why certain edits improve conversion
-- **ab-testing**: For testing copy variations
 
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