Add experiment ideas sections to all CRO skills

Adds curated A/B test experiments from SaaS CRO playbook to:
- page-cro: homepage, pricing, demo, resource page experiments
- signup-flow-cro: form design, copy, trial, post-submit experiments
- onboarding-cro: flow simplification, guided experience, personalization
- form-cro: structure, copy, mobile, type-specific experiments
- popup-cro: placement, triggers, messaging, personalization
- paywall-upgrade-cro: triggers, design, pricing, trials, personalization

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

skills/paywall-upgrade-cro.md

@@ -394,6 +394,162 @@ What to measure and expected benchmarks
 
 ---
 
+## Experiment Ideas
+
+### 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
+
+---
+
 ## Questions to Ask
 
 If you need more context: