feat: rename 15 skills for shorter, cleaner names

Renames:
- ab-test-setup → ab-testing
- analytics-tracking → analytics
- competitor-alternatives → competitors
- email-sequence → emails
- free-tool-strategy → free-tools
- launch-strategy → launch
- onboarding-cro → onboarding
- paywall-upgrade-cro → paywalls
- popup-cro → popups
- pricing-strategy → pricing
- product-marketing-context → product-marketing
- referral-program → referrals
- schema-markup → schema
- signup-flow-cro → signup
- social-content → social

Updates all cross-references in skills, references, tools,
marketplace.json, README, AGENTS.md, and CONTRIBUTING.md.

BREAKING: Users with installed skills will need to reinstall.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

skills/lead-magnets/SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: lead-magnets
-description: When the user wants to create, plan, or optimize a lead magnet for email capture or lead generation. Also use when the user mentions "lead magnet," "gated content," "content upgrade," "downloadable," "ebook," "cheat sheet," "checklist," "template download," "opt-in," "freebie," "PDF download," "resource library," "content offer," "email capture content," "Notion template," "spreadsheet template," or "what should I give away for emails." Use this for planning what to create and how to distribute it. For interactive tools as lead magnets, see free-tool-strategy. For writing the actual content, see copywriting. For the email sequence after capture, see email-sequence.
+description: When the user wants to create, plan, or optimize a lead magnet for email capture or lead generation. Also use when the user mentions "lead magnet," "gated content," "content upgrade," "downloadable," "ebook," "cheat sheet," "checklist," "template download," "opt-in," "freebie," "PDF download," "resource library," "content offer," "email capture content," "Notion template," "spreadsheet template," or "what should I give away for emails." Use this for planning what to create and how to distribute it. For interactive tools as lead magnets, see free-tools. For writing the actual content, see copywriting. For the email sequence after capture, see emails.
 metadata:
   version: 1.0.0
 ---
@@ -116,7 +116,7 @@ Goal: Help implement. Remove friction to purchase.
 | Template | "Ready-to-Use Sales Email Templates" |
 | Free trial | "14-Day Free Trial" |
 | Implementation guide | "Migration Checklist: Switch in 30 Minutes" |
-| ROI calculator | "Calculate Your Savings" (→ see **free-tool-strategy**) |
+| ROI calculator | "Calculate Your Savings" (→ see **free-tools**) |
 
 ---
 
@@ -148,7 +148,7 @@ Rule of thumb: Ask for the minimum needed. Every extra field reduces conversion
 - Reduce risk: "No spam. Unsubscribe anytime."
 
 **For form optimization**: See **form-cro** skill
-**For popup implementation**: See **popup-cro** skill
+**For popup implementation**: See **popups** skill
 
 ---
 
@@ -196,14 +196,14 @@ Don't waste the thank you page. After they've converted:
 
 - Trigger on exit intent or scroll depth
 - Match the popup offer to the page content
-- **See popup-cro** for implementation
+- **See popups** for implementation
 
 ### Social Media
 
 - Share snippets and teasers from the lead magnet
 - Create carousel posts from key points
 - Use the lead magnet as the CTA in your bio/profile
-- **See social-content** for social strategy
+- **See social** for social strategy
 
 ### Paid Promotion
 
@@ -298,13 +298,13 @@ When creating a lead magnet strategy, provide:
 
 ## Related Skills
 
-- **free-tool-strategy**: For interactive tools as lead magnets (calculators, graders, quizzes)
+- **free-tools**: For interactive tools as lead magnets (calculators, graders, quizzes)
 - **copywriting**: For writing the lead magnet content itself
-- **email-sequence**: For nurture sequences after lead capture
+- **emails**: For nurture sequences after lead capture
 - **page-cro**: For optimizing lead magnet landing pages
-- **popup-cro**: For popup-based lead capture
+- **popups**: For popup-based lead capture
 - **form-cro**: For optimizing capture forms
 - **content-strategy**: For content planning and topic selection
-- **analytics-tracking**: For measuring lead magnet performance
+- **analytics**: For measuring lead magnet performance
 - **paid-ads**: For paid promotion of lead magnets
-- **social-content**: For social media promotion
+- **social**: For social media promotion

skills/lead-magnets/references/format-guide.md

@@ -171,7 +171,7 @@ Detailed creation guidance for each lead magnet format.
 
 **Implementation**: Gate results behind email capture. The quiz itself is ungated — the personalized results require an email.
 
-**For building interactive quizzes**: See **free-tool-strategy** skill for technical implementation guidance.
+**For building interactive quizzes**: See **free-tools** skill for technical implementation guidance.
 
 ---