release: v3.31.0 — Skills 2.0 taxonomy, evals, lifecycle

- §5.0 Two Kinds of Skills: Capability Uplift vs Encoded Preference
- §5.X Skill Lifecycle & Retirement: Catch Regressions + Spot Outgrowth
- §5.Y Skill Evals: Benchmark Mode, A/B Testing, Trigger Tuning
- Vitals + SE-CoVe community plugins documented (§8.5)
- Memory system: 3 corrections (Auto-Memories v2.1.59+, thresholds, WHAT/WHY/HOW)

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

README.md

@@ -6,7 +6,7 @@
 
 <p align="center">
   <a href="https://github.com/FlorianBruniaux/claude-code-ultimate-guide/stargazers"><img src="https://img.shields.io/github/stars/FlorianBruniaux/claude-code-ultimate-guide?style=for-the-badge" alt="Stars"/></a>
-  <a href="./CHANGELOG.md"><img src="https://img.shields.io/badge/Updated-Mar_5,_2026_·_v3.30.2-brightgreen?style=for-the-badge" alt="Last Update"/></a>
+  <a href="./CHANGELOG.md"><img src="https://img.shields.io/badge/Updated-Mar_6,_2026_·_v3.31.0-brightgreen?style=for-the-badge" alt="Last Update"/></a>
   <a href="./quiz/"><img src="https://img.shields.io/badge/Quiz-274_questions-orange?style=for-the-badge" alt="Quiz"/></a>
   <a href="./examples/"><img src="https://img.shields.io/badge/Templates-176-green?style=for-the-badge" alt="Templates"/></a>
   <a href="./guide/security-hardening.md"><img src="https://img.shields.io/badge/🛡️_Threat_DB-24_CVEs_·_655_malicious_skills-red?style=for-the-badge" alt="Threat Database"/></a>
@@ -846,7 +846,7 @@ See [CONTRIBUTING.md](./CONTRIBUTING.md) for guidelines.
 
 ---
 
-*Version 3.30.2 | Updated daily · Mar 5, 2026 | Crafted with Claude*
+*Version 3.31.0 | Updated daily · Mar 6, 2026 | Crafted with Claude*
 
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