Consolidate docs: move design/docs files to docs folder

- Moved DESIGN-GUIDE.md → docs/30-FRONTEND/DESIGN-GUIDE.md
- Moved frontend/DESIGN_SYSTEM.md → docs/30-FRONTEND/DESIGN-TOKENS.md
- Moved IGNY8-APP.md → docs/00-SYSTEM/IGNY8-APP.md
- Moved fixes-kb.md → docs/90-REFERENCE/FIXES-KB.md
- Moved FINAL_PRELAUNCH.md → docs/plans/FINAL-PRELAUNCH.md
- Updated all references in .rules, README.md, docs/INDEX.md
- Updated ESLint plugin documentation comments
- Root folder now only contains: .rules, CHANGELOG.md, README.md

README.md

@@ -10,10 +10,10 @@
 
 | Document | Description |
 |----------|-------------|
-| [IGNY8-APP.md](IGNY8-APP.md) | Executive summary (non-technical) |
+| [docs/00-SYSTEM/IGNY8-APP.md](docs/00-SYSTEM/IGNY8-APP.md) | Executive summary (non-technical) |
 | [docs/INDEX.md](docs/INDEX.md) | Full documentation index |
 | [CHANGELOG.md](CHANGELOG.md) | Version history |
-| [RULES.md](RULES.md) | Documentation maintenance rules |
+| [.rules](.rules) | AI agent rules |
 
 ---
 
@@ -40,19 +40,19 @@ IGNY8 is a full-stack SaaS platform that combines AI-powered content generation
 igny8/
 ├── README.md             # This file
 ├── CHANGELOG.md          # Version history
-├── IGNY8-APP.md          # Executive summary
-├── RULES.md              # Documentation rules
+├── .rules                # AI agent rules
 ├── backend/              # Django REST API + Celery
 ├── frontend/             # React + Vite SPA
 ├── docs/                 # Full documentation
 │   ├── INDEX.md          # Documentation navigation
-│   ├── 00-SYSTEM/        # Architecture & auth
+│   ├── 00-SYSTEM/        # Architecture, auth, IGNY8-APP
 │   ├── 10-MODULES/       # Module documentation
 │   ├── 20-API/           # API endpoints
-│   ├── 30-FRONTEND/      # Frontend pages & stores
+│   ├── 30-FRONTEND/      # Frontend pages, stores, design system
 │   ├── 40-WORKFLOWS/     # Cross-module workflows
 │   ├── 50-DEPLOYMENT/    # Deployment guides
-│   └── 90-REFERENCE/     # Models & AI functions
+│   ├── 90-REFERENCE/     # Models, AI functions, fixes
+│   └── plans/            # Implementation plans
 └── docker-compose.app.yml
 ```