refactor(skills): move copy-editing catalogs to references

Keep the decision steps in SKILL.md and move catalogs, examples, and
checklists verbatim to references/ to reduce the context cost of loading the
skill.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

shared/skills/copy-editing/references/common-copy-problems.md

@@ -0,0 +1,33 @@
+# Common Copy Problems & Fixes
+
+## Problem: Wall of Features
+**Symptom:** List of what the product does without why it matters
+**Fix:** Add "which means..." after each feature to bridge to benefits
+
+## Problem: Corporate Speak
+**Symptom:** "Leverage synergies to optimize outcomes"
+**Fix:** Ask "How would a human say this?" and use those words
+
+## Problem: Weak Opening
+**Symptom:** Starting with company history or vague statements
+**Fix:** Lead with the reader's problem or desired outcome
+
+## Problem: Buried CTA
+**Symptom:** The ask comes after too much buildup, or isn't clear
+**Fix:** Make the CTA obvious, early, and repeated
+
+## Problem: No Proof
+**Symptom:** "Customers love us" with no evidence
+**Fix:** Add specific testimonials, numbers, or case references
+
+## Problem: Generic Claims
+**Symptom:** "We help businesses grow"
+**Fix:** Specify who, how, and by how much
+
+## Problem: Mixed Audiences
+**Symptom:** Copy tries to speak to everyone, resonates with no one
+**Fix:** Pick one audience and write directly to them
+
+## Problem: Feature Overload
+**Symptom:** Listing every capability, overwhelming the reader
+**Fix:** Focus on 3-5 key benefits that matter most to the audience