Optimize skill files for AI agent use with progressive disclosure

- Fix marketplace.json: add 2 missing skills (content-strategy, product-marketing-context)
- Refactor 10 skills over 500 lines to use references/ folders:
  - email-sequence: 926 → 291 lines
  - social-content: 809 → 276 lines
  - competitor-alternatives: 750 → 253 lines
  - pricing-strategy: 712 → 226 lines
  - programmatic-seo: 628 → 235 lines
  - referral-program: 604 → 239 lines
  - schema-markup: 598 → 175 lines
  - free-tool-strategy: 576 → 176 lines
  - paywall-upgrade-cro: 572 → 224 lines
  - marketing-ideas: 566 → 165 lines

Each skill now has core workflow in SKILL.md (<500 lines) with detailed
content in references/ folder for progressive disclosure.

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

skills/paywall-upgrade-cro/references/experiments.md

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+# Paywall Experiment Ideas
+
+Comprehensive list of A/B tests and experiments for paywall optimization.
+
+## Trigger & Timing Experiments
+
+### When to Show
+- Test trigger timing: after aha moment vs. at feature attempt
+- Early trial reminder (7 days) vs. late reminder (1 day before)
+- Show after X actions completed vs. after X days
+- Test soft prompts at different engagement thresholds
+- Trigger based on usage patterns vs. time-based only
+
+### Trigger Type
+- Hard gate (can't proceed) vs. soft gate (preview + prompt)
+- Feature lock vs. usage limit as primary trigger
+- In-context modal vs. dedicated upgrade page
+- Banner reminder vs. modal prompt
+- Exit-intent on free plan pages
+
+---
+
+## Paywall Design Experiments
+
+### Layout & Format
+- Full-screen paywall vs. modal overlay
+- Minimal paywall (CTA-focused) vs. feature-rich paywall
+- Single plan display vs. plan comparison
+- Image/preview included vs. text-only
+- Vertical layout vs. horizontal layout on desktop
+
+### Value Presentation
+- Feature list vs. benefit statements
+- Show what they'll lose (loss aversion) vs. what they'll gain
+- Personalized value summary based on usage
+- Before/after demonstration
+- ROI calculator or value quantification
+
+### Visual Elements
+- Add product screenshots or previews
+- Include short demo video or GIF
+- Test illustration vs. product imagery
+- Animated vs. static paywall
+- Progress visualization (what they've accomplished)
+
+---
+
+## Pricing Presentation Experiments
+
+### Price Display
+- Show monthly vs. annual vs. both with toggle
+- Highlight savings for annual ($ amount vs. % off)
+- Price per day framing ("Less than a coffee")
+- Show price after trial vs. emphasize "Start Free"
+- Display price prominently vs. de-emphasize until click
+
+### Plan Options
+- Single recommended plan vs. multiple tiers
+- Add "Most Popular" badge to target plan
+- Test number of visible plans (2 vs. 3)
+- Show enterprise/custom tier vs. hide it
+- Include one-time purchase option alongside subscription
+
+### Discounts & Offers
+- First month/year discount for conversion
+- Limited-time upgrade offer with countdown
+- Loyalty discount based on free usage duration
+- Bundle discount for annual commitment
+- Referral discount for social proof
+
+---
+
+## Copy & Messaging Experiments
+
+### Headlines
+- Benefit-focused ("Unlock unlimited projects") vs. feature-focused ("Get Pro features")
+- Question format ("Ready to do more?") vs. statement format
+- Urgency-based ("Don't lose your work") vs. value-based
+- Personalized headline with user's name or usage data
+- Social proof headline ("Join 10,000+ Pro users")
+
+### CTAs
+- "Start Free Trial" vs. "Upgrade Now" vs. "Continue with Pro"
+- First person ("Start My Trial") vs. second person ("Start Your Trial")
+- Value-specific ("Unlock Unlimited") vs. generic ("Upgrade")
+- Add urgency ("Upgrade Today") vs. no pressure
+- Include price in CTA vs. separate price display
+
+### Objection Handling
+- Add money-back guarantee messaging
+- Show "Cancel anytime" prominently
+- Include FAQ on paywall
+- Address specific objections based on feature gated
+- Add chat/support option on paywall
+
+---
+
+## Trial & Conversion Experiments
+
+### Trial Structure
+- 7-day vs. 14-day vs. 30-day trial length
+- Credit card required vs. not required for trial
+- Full-access trial vs. limited feature trial
+- Trial extension offer for engaged users
+- Second trial offer for expired/churned users
+
+### Trial Expiration
+- Countdown timer visibility (always vs. near end)
+- Email reminders: frequency and timing
+- Grace period after expiration vs. immediate downgrade
+- "Last chance" offer with discount
+- Pause option vs. immediate cancellation
+
+### Upgrade Path
+- One-click upgrade from paywall vs. separate checkout
+- Pre-filled payment info for returning users
+- Multiple payment methods offered
+- Quarterly plan option alongside monthly/annual
+- Team invite flow for solo-to-team conversion
+
+---
+
+## Personalization Experiments
+
+### Usage-Based
+- Personalize paywall copy based on features used
+- Highlight most-used premium features
+- Show usage stats ("You've created 50 projects")
+- Recommend plan based on behavior patterns
+- Dynamic feature emphasis based on user segment
+
+### Segment-Specific
+- Different paywall for power users vs. casual users
+- B2B vs. B2C messaging variations
+- Industry-specific value propositions
+- Role-based feature highlighting
+- Traffic source-based messaging
+
+---
+
+## Frequency & UX Experiments
+
+### Frequency Capping
+- Test number of prompts per session
+- Cool-down period after dismiss (hours vs. days)
+- Escalating urgency over time vs. consistent messaging
+- Once per feature vs. consolidated prompts
+- Re-show rules after major engagement
+
+### Dismiss Behavior
+- "Maybe later" vs. "No thanks" vs. "Remind me tomorrow"
+- Ask reason for declining
+- Offer alternative (lower tier, annual discount)
+- Exit survey on dismiss
+- Friendly vs. neutral decline copy