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/onboarding-cro.md

@@ -327,6 +327,93 @@ For each issue:
 
 ---
 
+## Experiment Ideas
+
+### Flow Simplification Experiments
+
+**Reduce Friction**
+- Add or remove email verification during onboarding
+- Test empty states vs. pre-populated dummy data
+- Provide pre-filled templates to accelerate setup
+- Add OAuth options for faster account linking
+- Reduce number of required onboarding steps
+
+**Step Sequencing**
+- Test different ordering of onboarding steps
+- Lead with highest-value features first
+- Move friction-heavy steps later in flow
+- Test required vs. optional step balance
+
+**Progress & Motivation**
+- Add progress bars or completion percentages
+- Test onboarding checklists (3-5 items vs. 5-7 items)
+- Gamify milestones with badges or rewards
+- Show "X% complete" messaging
+
+---
+
+### Guided Experience Experiments
+
+**Product Tours**
+- Add interactive product tours (Navattic, Storylane)
+- Test tooltip-based guidance vs. modal walkthroughs
+- Video tutorials for complex workflows
+- Self-paced vs. guided tour options
+
+**CTA Optimization**
+- Test CTA text variations during onboarding
+- Test CTA placement within onboarding screens
+- Add in-app tooltips for advanced features
+- Sticky CTAs that persist during onboarding
+
+---
+
+### Personalization Experiments
+
+**User Segmentation**
+- Segment users by role to show relevant features
+- Segment by goal to customize onboarding path
+- Create role-specific dashboards
+- Ask use-case question to personalize flow
+
+**Dynamic Content**
+- Personalized welcome messages
+- Industry-specific examples and templates
+- Dynamic feature recommendations based on answers
+
+---
+
+### Quick Wins & Engagement Experiments
+
+**Time-to-Value**
+- Highlight quick wins early ("Complete your first X")
+- Show success messages after key actions
+- Display progress celebrations at milestones
+- Suggest next steps after each completion
+
+**Support & Help**
+- Offer free onboarding calls for complex products
+- Add contextual help throughout onboarding
+- Test chat support availability during onboarding
+- Proactive outreach for stuck users
+
+---
+
+### Email & Multi-Channel Experiments
+
+**Onboarding Emails**
+- Personalized welcome email from founder
+- Behavior-based emails (triggered by actions/inactions)
+- Test email timing and frequency
+- Include quick tips and video content
+
+**Feedback Loops**
+- Add NPS survey during onboarding
+- Ask "What's blocking you?" for incomplete users
+- Follow-up based on NPS score
+
+---
+
 ## Questions to Ask
 
 If you need more context: