Refactor remaining skills for progressive disclosure

Phase 2 refactoring of skills >500 lines and medium-sized skills:

- paid-ads: 553 → 297 lines
  - Extract ad-copy-templates.md, audience-targeting.md, platform-setup-checklists.md

- analytics-tracking: 541 → 292 lines
  - Extract ga4-implementation.md, gtm-implementation.md, event-library.md

- ab-test-setup: 510 → 264 lines
  - Extract test-templates.md, sample-size-guide.md

- copywriting: 458 → 248 lines
  - Extract copy-frameworks.md (headline formulas, section types)

- page-cro: 336 → 180 lines
  - Extract experiments.md (experiment ideas by page type)

- onboarding-cro: 435 → 218 lines
  - Extract experiments.md (onboarding experiment ideas)

All skills now use progressive disclosure with references/ folders,
keeping SKILL.md files focused on core workflow while detailed
content is available when needed.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

skills/paid-ads/references/ad-copy-templates.md

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+# Ad Copy Templates Reference
+
+Detailed formulas and templates for writing high-converting ad copy.
+
+## Primary Text Formulas
+
+### Problem-Agitate-Solve (PAS)
+
+```
+[Problem statement]
+[Agitate the pain]
+[Introduce solution]
+[CTA]
+```
+
+**Example:**
+> Spending hours on manual reporting every week?
+> While you're buried in spreadsheets, your competitors are making decisions.
+> [Product] automates your reports in minutes.
+> Start your free trial →
+
+---
+
+### Before-After-Bridge (BAB)
+
+```
+[Current painful state]
+[Desired future state]
+[Your product as the bridge]
+```
+
+**Example:**
+> Before: Chasing down approvals across email, Slack, and spreadsheets.
+> After: Every approval tracked, automated, and on time.
+> [Product] connects your tools and keeps projects moving.
+
+---
+
+### Social Proof Lead
+
+```
+[Impressive stat or testimonial]
+[What you do]
+[CTA]
+```
+
+**Example:**
+> "We cut our reporting time by 75%." — Sarah K., Marketing Director
+> [Product] automates the reports you hate building.
+> See how it works →
+
+---
+
+### Feature-Benefit Bridge
+
+```
+[Feature]
+[So that...]
+[Which means...]
+```
+
+**Example:**
+> Real-time collaboration on documents
+> So your team always works from the latest version
+> Which means no more version confusion or lost work
+
+---
+
+### Direct Response
+
+```
+[Bold claim/outcome]
+[Proof point]
+[CTA with urgency if genuine]
+```
+
+**Example:**
+> Cut your reporting time by 80%
+> Join 5,000+ marketing teams already using [Product]
+> Start free → First month 50% off
+
+---
+
+## Headline Formulas
+
+### For Search Ads
+
+| Formula | Example |
+|---------|---------|
+| [Keyword] + [Benefit] | "Project Management That Teams Actually Use" |
+| [Action] + [Outcome] | "Automate Reports \| Save 10 Hours Weekly" |
+| [Question] | "Tired of Manual Data Entry?" |
+| [Number] + [Benefit] | "500+ Teams Trust [Product] for [Outcome]" |
+| [Keyword] + [Differentiator] | "CRM Built for Small Teams" |
+| [Price/Offer] + [Keyword] | "Free Project Management \| No Credit Card" |
+
+### For Social Ads
+
+| Type | Example |
+|------|---------|
+| Outcome hook | "How we 3x'd our conversion rate" |
+| Curiosity hook | "The reporting hack no one talks about" |
+| Contrarian hook | "Why we stopped using [common tool]" |
+| Specificity hook | "The exact template we use for..." |
+| Question hook | "What if you could cut your admin time in half?" |
+| Number hook | "7 ways to improve your workflow today" |
+| Story hook | "We almost gave up. Then we found..." |
+
+---
+
+## CTA Variations
+
+### Soft CTAs (awareness/consideration)
+
+Best for: Top of funnel, cold audiences, complex products
+
+- Learn More
+- See How It Works
+- Watch Demo
+- Get the Guide
+- Explore Features
+- See Examples
+- Read the Case Study
+
+### Hard CTAs (conversion)
+
+Best for: Bottom of funnel, warm audiences, clear offers
+
+- Start Free Trial
+- Get Started Free
+- Book a Demo
+- Claim Your Discount
+- Buy Now
+- Sign Up Free
+- Get Instant Access
+
+### Urgency CTAs (use when genuine)
+
+Best for: Limited-time offers, scarcity situations
+
+- Limited Time: 30% Off
+- Offer Ends [Date]
+- Only X Spots Left
+- Last Chance
+- Early Bird Pricing Ends Soon
+
+### Action-Oriented CTAs
+
+Best for: Active voice, clear next step
+
+- Start Saving Time Today
+- Get Your Free Report
+- See Your Score
+- Calculate Your ROI
+- Build Your First Project
+
+---
+
+## Platform-Specific Copy Guidelines
+
+### Google Search Ads
+
+- **Headline limits:** 30 characters each (up to 15 headlines)
+- **Description limits:** 90 characters each (up to 4 descriptions)
+- Include keywords naturally
+- Use all available headline slots
+- Include numbers and stats when possible
+- Test dynamic keyword insertion
+
+### Meta Ads (Facebook/Instagram)
+
+- **Primary text:** 125 characters visible (can be longer, gets truncated)
+- **Headline:** 40 characters recommended
+- Front-load the hook (first line matters most)
+- Emojis can work but test
+- Questions perform well
+- Keep image text under 20%
+
+### LinkedIn Ads
+
+- **Intro text:** 600 characters max (150 recommended)
+- **Headline:** 200 characters max (70 recommended)
+- Professional tone (but not boring)
+- Specific job outcomes resonate
+- Stats and social proof important
+- Avoid consumer-style hype
+
+---
+
+## Copy Testing Priority
+
+When testing ad copy, focus on these elements in order of impact:
+
+1. **Hook/angle** (biggest impact on performance)
+2. **Headline**
+3. **Primary benefit**
+4. **CTA**
+5. **Supporting proof points**
+
+Test one element at a time for clean data.