Add OJP certification exam structure with 16 ready-to-use Copilot prompts

documents/exam/CHANGELOG.md

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+# OJP Certification Exam - Changelog
+
+## 2026-04-30: Update for Main Branch Changes (Chapters 8-12a)
+
+### Summary
+Reviewed all changes in main branch since the exam structure was created (2026-02-09) and updated exam documentation to reflect new content.
+
+### Added to Exam Structure
+
+#### 1. New Chapter 12a: Query Result Caching ✅
+**Why Added**: This is a new major feature chapter added to the eBook (Part III: Advanced Features). Query result caching is an important production feature that should be tested in certification.
+
+**Changes Made**:
+- Updated all references from "Chapters 8-12" to "Chapters 8-12a" in Part III
+- Updated eBook structure from 23 chapters to 24 chapters  
+- Added caching topics to all three difficulty levels:
+  - **Easy**: Cache basics, configuration patterns, TTL concepts
+  - **Medium**: Configuring cache rules, TTL strategies, invalidation patterns
+  - **Hard**: Complex cache invalidation scenarios, multi-server cache limitations
+- Updated EXECUTION_PHASES.md prompts to include Chapter 12a
+- Updated README.md, EXAM_PLAN.md, IMPLEMENTATION_SUMMARY.md
+- Updated easy/medium/hard README files with caching topics
+
+**Justification**: Query result caching is a significant feature (30KB chapter) that covers:
+- Configuration-based cache rules
+- TTL (time-to-live) strategies
+- Cache invalidation patterns
+- Performance optimization
+- Multi-server limitations
+This is production-relevant knowledge that OJP practitioners should understand.
+
+### Reviewed but NOT Added
+
+#### 1. Minor Documentation Updates ❌
+**Examples**:
+- Micronaut integration updated to use OjpDataSource
+- Spring Boot Hibernate hbm2ddl.halt_on_error notes
+- XA action split documentation clarifications
+- Action Pattern documentation fixes (ADR-009)
+- Health check properties bridging fixes
+- Various ADR updates and clarifications
+
+**Why Not Added**: These are documentation improvements, clarifications, and minor updates to existing content. They don't introduce new concepts that require separate exam questions. The existing questions covering these topics (framework integration, XA transactions, architecture) already encompass these refinements.
+
+#### 2. Implementation Fixes and Refactorings ❌
+**Examples**:
+- Multinode pool coordinator fixes
+- Cache implementation refactorings
+- SQL enhancer configuration updates
+- Connection error handling improvements
+- Checkstyle and code quality fixes
+
+**Why Not Added**: These are implementation details and bug fixes that don't change the conceptual understanding or usage patterns that certification should test. The exam tests user-facing features and concepts, not internal implementation details.
+
+#### 3. Development Process Changes ❌
+**Examples**:
+- GitHub Actions updates to Node.js 24
+- SonarLint and Checkstyle enforcement
+- Copilot instructions updates
+- Agent behavior guidelines
+
+**Why Not Added**: These are internal development process improvements. While important for contributors, they don't represent core OJP knowledge that end-users need for certification. The existing Development section (Part V) adequately covers contribution workflows.
+
+#### 4. Release Version Updates ❌
+**Examples**:
+- Versions 0.4.3-beta through 0.4.8-beta
+- Spring Boot security CVE fixes
+- Version number bumps
+
+**Why Not Added**: Specific version numbers and release notes are not appropriate certification content. The exam focuses on concepts and features that persist across versions, not transient version details.
+
+#### 5. New Contributor Badges ❌
+**Examples**:
+- OJP Advocate badge for Pawel
+- Various contributor recognition updates
+
+**Why Not Added**: While the contributor recognition program is mentioned in the exam structure (Part V: Development), specific badge awards are not exam material. The existing questions about the recognition program structure are sufficient.
+
+#### 6. Infrastructure and Monitoring Updates ❌
+**Examples**:
+- Grafana dashboard updates
+- Production deployment guide refinements
+- Telemetry improvements
+
+**Why Not Added**: These are enhancements to existing features already covered in Part IV: Operations. The conceptual understanding of telemetry and monitoring (already in the exam) is more important than specific dashboard configurations.
+
+### Coverage Analysis
+
+**Main Branch Commits Reviewed**: ~100 commits from 2026-02-09 to 2026-04-30
+
+**Significant New Features Identified**: 1
+- Query Result Caching (Chapter 12a) ✅ Added
+
+**Documentation Updates**: ~50 commits
+- Refinements to existing content ❌ Not added (covered by existing structure)
+
+**Bug Fixes and Refactorings**: ~30 commits  
+- Internal improvements ❌ Not added (not user-facing)
+
+**Development Process**: ~20 commits
+- Tooling and workflow improvements ❌ Not added (internal process)
+
+### Updated Metrics
+
+**Before Update**:
+- 23 eBook chapters covered
+- Part III: 5 chapters (Chapters 8-12)
+
+**After Update**:
+- 24 eBook chapters covered
+- Part III: 6 chapters (Chapters 8-12a)
+- Question distribution remains: 75 questions for Advanced Features
+
+### Rationale for Minimal Changes
+
+The exam structure was intentionally kept stable because:
+
+1. **Conceptual Focus**: The exam tests understanding of OJP concepts, not specific implementation details
+2. **Version Independence**: Questions should work across OJP versions
+3. **User-Facing Features**: Only user-facing features require new exam coverage
+4. **Existing Coverage**: Most updates refined existing topics already covered
+
+The single addition (Chapter 12a) represents genuine new functionality that users need to understand for production deployment.
+
+### Next Actions
+
+1. ✅ Updated all exam documentation to include Chapter 12a
+2. ✅ Updated EXECUTION_PHASES.md prompts to cover caching
+3. ✅ Updated difficulty level descriptions
+4. ⏭️ When questions are created, ensure caching questions cover:
+   - Easy: What is query result caching? Basic cache configuration
+   - Medium: Configuring cache rules, TTL strategies, invalidation
+   - Hard: Multi-server cache limitations, complex invalidation scenarios
+
+---
+
+**Review Date**: 2026-04-30  
+**Reviewer**: GitHub Copilot  
+**Main Branch Commits Reviewed**: e3536a9..c6955b91 (~100 commits)  
+**Changes Made**: Added Chapter 12a (Query Result Caching) coverage  
+**Next Review**: After next major feature release