feat: adaptive onboarding architecture v2.0.0 (v3.23.0)

Major overhaul of onboarding system with adaptive topic selection based on
user context and keywords. Addresses 8 critical gaps identified by technical-
writer agent challenge.

Core Changes:
- Adaptive matrix: core topics (always) + adaptive topics (keyword-triggered)
- Security-first: moved sandbox_native_guide to beginner_5min (before commands)
- Time budget validation: all 18 profiles validated at 6-8 min/topic
- Quiz integration: positioned as exit activity in Phase 4 wrap-up
- New learn_security goal with 2 profiles (beginner_15min, advanced_60min)

Technical Improvements:
- Added onboarding_matrix_meta for version tracking and maintenance triggers
- Created validation script (validate-onboarding.sh) with 6 automated checks
- Created automation script (detect-new-onboarding-topics.sh) for monthly reviews
- Fixed 8 missing deep_dive keys (rules, workflow, fix, architecture, etc.)
- Removed duplicate deep_dive section causing validation failures

Documentation:
- README.md: version 3.23.0, harmonized counts (106 templates, 49 evaluations)
- CHANGELOG.md: comprehensive v3.23.0 entry with all changes
- Onboarding-prompt.md: updated Phase 1.5, 2, 4 with adaptive logic
- Reference.yaml: 180+ lines added for adaptive architecture

Validation:
- All 18 profiles pass time budget constraints (30-50% buffer maintained)
- All deep_dive keys verified (no missing references)
- Version synchronized across 6 files via sync-version.sh

Challenge: technical-writer agent identified 8 gaps in initial analysis
Result: Full adaptive approach implemented, all gaps addressed

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

guide/ai-ecosystem.md

@@ -2181,6 +2181,7 @@ For discovering and distributing agent skills beyond local creation:
 npx add-skill vercel-labs/agent-skills  # React/Next.js (35K+ installs)
 npx add-skill supabase/agent-skills     # Postgres patterns
 npx add-skill anthropics/skills         # Frontend design + skill-creator
+npx add-skill anthropics/claude-plugins-official  # CLAUDE.md auditor + plugin dev tools
 ```
 
 **Supported agents**: 20+ including Claude Code, Cursor, GitHub Copilot, Windsurf, Cline, Goose

guide/cheatsheet.md

@@ -6,7 +6,7 @@
 
 **Written with**: Claude (Anthropic)
 
-**Version**: 3.22.1 | **Last Updated**: January 2026
+**Version**: 3.23.0 | **Last Updated**: January 2026
 
 ---
 
@@ -484,4 +484,4 @@ 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 3.22.1*
+*Last updated: February 2026 | Version 3.23.0*

guide/ultimate-guide.md

@@ -10,7 +10,7 @@
 
 **Last updated**: January 2026
 
-**Version**: 3.22.1
+**Version**: 3.23.0
 
 ---
 
@@ -4139,7 +4139,7 @@ The `.claude/` folder is your project's Claude Code directory for memory, settin
 | Personal preferences | `CLAUDE.md` | ❌ Gitignore |
 | Personal permissions | `settings.local.json` | ❌ Gitignore |
 
-### 3.22.1 Version Control & Backup
+### 3.23.0 Version Control & Backup
 
 **Problem**: Without version control, losing your Claude Code configuration means hours of manual reconfiguration across agents, skills, hooks, and MCP servers.
 
@@ -17782,4 +17782,4 @@ We'll evaluate and add it to this section if it meets quality criteria.
 
 **Contributions**: Issues and PRs welcome.
 
-**Last updated**: January 2026 | **Version**: 3.22.1
+**Last updated**: January 2026 | **Version**: 3.23.0