release: v3.20.0 - Multi-Agent Code Review Automation

Integration of production-grade PR review patterns from Pat Cullen + Méthode Aristote.

New Features:
- Resource evaluation: Pat Cullen Final Review (5/5 - Critical)
- Enhanced /review-pr: +150 lines with Advanced Multi-Agent Review section
- Enhanced code-reviewer agent: +219 lines with anti-hallucination rules
- New workflow: Review Auto-Correction Loop in iterative-refinement.md
- Production example: Multi-Agent Code Review in ultimate-guide.md
- Reference updates: +3 entries (review_pr_advanced, review_anti_hallucination, review_auto_fix_loop)

Key Patterns:
- 3 specialized agents: Consistency, SOLID, Defensive Code Auditor
- Pre-flight check: git log Co-Authored-By detection
- Anti-hallucination: Grep/Glob verification before suggestions
- Severity classification: 🔴 Must Fix / 🟡 Should Fix / 🟢 Can Skip
- Convergence loop: review → fix → re-review (max 3 iterations)
- Conditional context loading: stack-agnostic decision table

Design Principles:
- Enrich existing files (no fragmentation)
- No breaking changes (review-pr.md template simple preserved)
- Complete attribution (Pat Cullen + Méthode Aristote with links)
- Audience-aware (beginner → advanced progression)

Files Modified:
- CHANGELOG.md, VERSION: bumped to 3.20.0
- docs/resource-evaluations/017-pat-cullen-final-review.md: NEW (120 lines)
- examples/commands/review-pr.md: 80 → 230 lines (+150)
- examples/agents/code-reviewer.md: 72 → 291 lines (+219)
- guide/workflows/iterative-refinement.md: 389 → 522 lines (+133)
- guide/ultimate-guide.md: +28 lines (Production Example section)
- machine-readable/reference.yaml: +3 entries
- README.md, guide/cheatsheet.md: version sync

Total: +537 insertions, 0 deletions (no breaking changes)

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

docs/resource-evaluations/README.md

@@ -54,7 +54,8 @@ Les documents de travail bruts (prompts Perplexity, audits clients) restent dans
 | **Peter Wooldridge** (Productivity Stack) | 2/5 | **3/5** | ✅ Practitioner Insights | [wooldridge-productivity-stack.md](./wooldridge-productivity-stack.md) |
 | **System Prompts** (Official vs Community) | 4/5 | **2/5** | ⚠️ Watch only (official sources exist) | [system-prompts-official-vs-community.md](./system-prompts-official-vs-community.md) |
 | **Worktrunk** | 4/5 | **4/5** | ✅ Intégré (workflow) | [worktrunk-evaluation.md](./worktrunk-evaluation.md) |
+| **Pat Cullen** (Multi-Agent PR Review) | 5/5 | **5/5** | ✅ Intégré (review-pr, code-reviewer, guide) | [017-pat-cullen-final-review.md](./017-pat-cullen-final-review.md) |
 
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-**Dernier update**: 2026-01-30 (16 évaluations)
+**Dernier update**: 2026-01-30 (17 évaluations)