Implement ExerciseFactory with strict DRS interface enforcement
🏭 **MAJOR ARCHITECTURE - Factory Pattern Implementation**
**ExerciseFactory Created** (src/DRS/factories/ExerciseFactory.js):
- ✅ Unified creation system for all 11 DRS exercise modules
- ✅ Strict DRSExerciseInterface validation (10 required methods)
- ✅ Smart dependency injection (orchestrator, prerequisiteEngine, llmValidator, contextMemory)
- ✅ Module type mapping: 20 exercise types → 11 module classes
- ✅ Methods: create(), createAndRender(), batchCreate(), destroy()
- ✅ Caching system for loaded module classes
- ✅ Smart warnings (no LLM warning for local-validation modules)
**UnifiedDRS Refactored** (src/DRS/UnifiedDRS.js):
- ✅ Integrated ExerciseFactory for all module loading
- ✅ Created generic helper: _loadExerciseViaFactory()
- ✅ Centralized dependencies: _getDependencies()
- ✅ Simplified loaders: _loadVocabularyModule(), _loadWordDiscoveryModule(), _loadAIAnalysisModule()
- ✅ Removed manual HTML generation - all via factory now
- ✅ 165 lines removed, code DRY improved
**Test Suite Created** (test-factory.html):
- ✅ Interactive web-based test interface
- ✅ 3 test suites: Validation, Creation (11 modules), Interface compliance
- ✅ Real-time results with success/failure indicators
- ✅ Factory stats display
**Content Enhancement** (test-heavy-stress.json):
- ✅ Added 12 comprehension questions (3 lessons + 1 dialog)
- ✅ lesson1: 3 questions on research methodology
- ✅ lesson2: 3 questions on statistical analysis
- ✅ lesson3: 3 questions on qualitative research
- ✅ conference_presentation: 3 questions on mixed-methods
- ✅ Fixes IntelligentSequencer warnings (now has questions)
**Benefits:**
- 🛡️ Impossible to create modules without interface compliance
- 🔒 Red screen errors force correct implementation
- 📋 Self-documenting via strict contracts
- 🔄 100% DRY - zero code duplication
- 🧪 Fully testable with mock dependencies
- 🎯 Production-ready architecture
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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