feat(security): add threat intelligence DB, security commands, and cheatsheet audit fixes (v3.26.0)

- Add threat-db.yaml v2.0.0 with 63 malicious skills, 22 CVEs, 4 campaigns
- Add /security-check, /security-audit, /update-threat-db slash commands
- Add Snyk ToxicSkills evaluation (58th resource evaluation)
- Fix cheatsheet: add Alt+T to keyboard shortcuts table, add /fast and /debug commands
- Update Features Meconnues table with Agent Teams and Auto-Memories
- Clean up cheatsheet.md.bak
- Bump version to 3.26.0

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

guide/ultimate-guide.md

@@ -10,7 +10,7 @@
 
 **Last updated**: January 2026
 
-**Version**: 3.24.0
+**Version**: 3.26.0
 
 ---
 
@@ -4283,7 +4283,7 @@ The `.claude/` folder is your project's Claude Code directory for memory, settin
 | Personal preferences | `CLAUDE.md` | ❌ Gitignore |
 | Personal permissions | `settings.local.json` | ❌ Gitignore |
 
-### 3.24.0 Version Control & Backup
+### 3.26.0 Version Control & Backup
 
 **Problem**: Without version control, losing your Claude Code configuration means hours of manual reconfiguration across agents, skills, hooks, and MCP servers.
 
@@ -19354,4 +19354,4 @@ We'll evaluate and add it to this section if it meets quality criteria.
 
 **Contributions**: Issues and PRs welcome.
 
-**Last updated**: January 2026 | **Version**: 3.24.0
+**Last updated**: January 2026 | **Version**: 3.26.0