Implement robust progress system with ultra-strict validation
**Core Architecture:**
- StrictInterface: Base class with visual error enforcement (red screen, sound, shake)
- ProgressItemInterface: Strict contract requiring 4 methods (validate, serialize, getWeight, canComplete)
- Implementation validation at startup - app refuses to start if methods missing
**Progress Items (8 types with realistic weights):**
- VocabularyDiscoveryItem (1pt) - Passive word exposure, no prerequisites
- VocabularyMasteryItem (1pt) - Active flashcards, requires discovery
- PhraseItem (6pts, 3x vocab) - Requires vocabulary mastery
- DialogItem (12pts, 6x vocab) - Complex, requires vocabulary mastery
- TextItem (15pts, 7.5x vocab) - Most complex, requires vocabulary mastery
- AudioItem (12pts, 6x vocab) - Requires vocabulary mastery
- ImageItem (6pts, 3x vocab) - Requires vocabulary discovered
- GrammarItem (6pts, 3x vocab) - Requires vocabulary discovered
**Realistic Progress Calculation:**
- 1 vocab word = 2 points total (discovery + mastery)
- Other items weighted 3x-7.5x heavier for realistic progression
- Example: 171 vocab (342pts) + 75 phrases (450pts) + 6 dialogs (72pts) + 3 texts (45pts) = 909 total points
- Discovering all words = 38% progress (not 76%)
**Services:**
- ContentProgressAnalyzer: Scans chapter content, creates progress items, calculates total weight
- ProgressTracker: Manages state, tracks completion, saves progress to server
- ImplementationValidator: Validates all implementations at startup
**Integration:**
- Application.js validates ALL item implementations before startup
- Missing methods trigger full-screen red error with impossible-to-ignore UI
- Sound alert + screen shake in dev mode
**Pedagogical Flow Enforced:**
Discovery (passive) → Mastery (active) → Application (context)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
StillHammer
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