Extract AI generation and parsing logic from monolithic index.js into
modular architecture under src/systems/generation/.
**Modules Created:**
- promptBuilder.js (319 lines) - AI prompt generation functions
- parser.js (152 lines) - Response parsing and stats extraction
- apiClient.js (154 lines) - Separate mode API call handler
- injector.js (216 lines) - Prompt injection for both modes
**Changes:**
- All functions preserve exact behavior from original
- Import paths calculated for browser module resolution
- Zero functionality changes, pure code organization
Reduces index.js by ~700 lines when combined with function removal
(to be committed separately).