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/email-sequence/references/sequence-templates.md

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+# Email Sequence Templates
+
+Detailed templates for common email sequences.
+
+## Welcome Sequence (Post-Signup)
+
+**Email 1: Welcome (Immediate)**
+- Subject: Welcome to [Product] — here's your first step
+- Deliver what was promised (lead magnet, access, etc.)
+- Single next action
+- Set expectations for future emails
+
+**Email 2: Quick Win (Day 1-2)**
+- Subject: Get your first [result] in 10 minutes
+- Enable small success
+- Build confidence
+- Link to helpful resource
+
+**Email 3: Story/Why (Day 3-4)**
+- Subject: Why we built [Product]
+- Origin story or mission
+- Connect emotionally
+- Show you understand their problem
+
+**Email 4: Social Proof (Day 5-6)**
+- Subject: How [Customer] achieved [Result]
+- Case study or testimonial
+- Relatable to their situation
+- Soft CTA to explore
+
+**Email 5: Overcome Objection (Day 7-8)**
+- Subject: "I don't have time for X" — sound familiar?
+- Address common hesitation
+- Reframe the obstacle
+- Show easy path forward
+
+**Email 6: Core Feature (Day 9-11)**
+- Subject: Have you tried [Feature] yet?
+- Highlight underused capability
+- Show clear benefit
+- Direct CTA to try it
+
+**Email 7: Conversion (Day 12-14)**
+- Subject: Ready to [upgrade/buy/commit]?
+- Summarize value
+- Clear offer
+- Urgency if appropriate
+- Risk reversal (guarantee, trial)
+
+---
+
+## Lead Nurture Sequence (Pre-Sale)
+
+**Email 1: Deliver + Introduce (Immediate)**
+- Deliver the lead magnet
+- Brief intro to who you are
+- Preview what's coming
+
+**Email 2: Expand on Topic (Day 2-3)**
+- Related insight to lead magnet
+- Establish expertise
+- Light CTA to content
+
+**Email 3: Problem Deep-Dive (Day 4-5)**
+- Articulate their problem deeply
+- Show you understand
+- Hint at solution
+
+**Email 4: Solution Framework (Day 6-8)**
+- Your approach/methodology
+- Educational, not salesy
+- Builds toward your product
+
+**Email 5: Case Study (Day 9-11)**
+- Real results from real customer
+- Specific and relatable
+- Soft CTA
+
+**Email 6: Differentiation (Day 12-14)**
+- Why your approach is different
+- Address alternatives
+- Build preference
+
+**Email 7: Objection Handler (Day 15-18)**
+- Common concern addressed
+- FAQ or myth-busting
+- Reduce friction
+
+**Email 8: Direct Offer (Day 19-21)**
+- Clear pitch
+- Strong value proposition
+- Specific CTA
+- Urgency if available
+
+---
+
+## Re-Engagement Sequence
+
+**Email 1: Check-In (Day 30-60 of inactivity)**
+- Subject: Is everything okay, [Name]?
+- Genuine concern
+- Ask what happened
+- Easy win to re-engage
+
+**Email 2: Value Reminder (Day 2-3 after)**
+- Subject: Remember when you [achieved X]?
+- Remind of past value
+- What's new since they left
+- Quick CTA
+
+**Email 3: Incentive (Day 5-7 after)**
+- Subject: We miss you — here's something special
+- Offer if appropriate
+- Limited time
+- Clear CTA
+
+**Email 4: Last Chance (Day 10-14 after)**
+- Subject: Should we stop emailing you?
+- Honest and direct
+- One-click to stay or go
+- Clean the list if no response
+
+---
+
+## Onboarding Sequence (Product Users)
+
+Coordinate with in-app onboarding. Email supports, doesn't duplicate.
+
+**Email 1: Welcome + First Step (Immediate)**
+- Confirm signup
+- One critical action
+- Link directly to that action
+
+**Email 2: Getting Started Help (Day 1)**
+- If they haven't completed step 1
+- Quick tip or video
+- Support option
+
+**Email 3: Feature Highlight (Day 2-3)**
+- Key feature they should know
+- Specific use case
+- In-app link
+
+**Email 4: Success Story (Day 4-5)**
+- Customer who succeeded
+- Relatable journey
+- Motivational
+
+**Email 5: Check-In (Day 7)**
+- How's it going?
+- Ask for feedback
+- Offer help
+
+**Email 6: Advanced Tip (Day 10-12)**
+- Power feature
+- For engaged users
+- Level-up content
+
+**Email 7: Upgrade/Expand (Day 14+)**
+- For trial users: conversion push
+- For free users: upgrade prompt
+- For paid: expansion opportunity