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>

guide/cheatsheet.md

@@ -12,7 +12,7 @@ tags: [cheatsheet, reference]
 
 **Written with**: Claude (Anthropic)
 
-**Version**: 3.30.2 | **Last Updated**: February 2026
+**Version**: 3.31.0 | **Last Updated**: February 2026
 
 ---
 
@@ -89,6 +89,7 @@ tags: [cheatsheet, reference]
 | **LSP Tool** | v2.0.74 | IDE-like navigation: symbols, types, refs. ~50ms vs 45s with grep. 11 languages |
 | **Voice Mode** | v2.1.x | Native voice input, free transcription, no rate limit impact |
 | **Remote Control** | v2.1.51 | Control local session from phone/browser (Research Preview, Pro/Max) |
+| **Skill Evals** | Mar 2026 | Two skill types: Capability Uplift (fills model gap, fades) / Encoded Preference (encodes workflow, stays). Benchmark Mode, A/B testing, Trigger Tuning. |
 
 **Activate LSP**: Add to `~/.claude/settings.json` → `{ "env": { "ENABLE_LSP_TOOL": "1" } }` (requires LSP server installed for your language: `tsserver`, `pylsp`, `gopls`, `rust-analyzer`, `sourcekit-lsp`...)
 
@@ -613,4 +614,4 @@ where.exe claude; claude doctor; claude mcp list
 
 **Author**: Florian BRUNIAUX | [@Méthode Aristote](https://methode-aristote.fr) | Written with Claude
 
-*Last updated: February 2026 | Version 3.30.2*
+*Last updated: February 2026 | Version 3.31.0*