fix #16: cleanup - remove old/dead code and update docs

- Delete apps/telegram-bot/storage.py (replaced by adapters/storage/json_file.py)
- Delete apps/telegram-bot/__init__.py (empty file)
- Delete apps/telegram-bot/requirements-dev.txt (dev deps in pyproject.toml)
- Update SPEC.md with new hexagonal architecture (core, adapters, apps)
- Update SPEC.md command reference: /update -> /edit
- Update README.md with new project structure and quick start
- Update CONTRIBUTING.md with new architecture and dev setup

CONTRIBUTING.md

@@ -5,27 +5,42 @@
 ```bash
 git clone https://git.fbrns.co/shoko/jigaido.git
 cd jigaido
+
+# Create virtual environment
 python -m venv venv
 source venv/bin/activate
-pip install -r requirements.txt
+
+# Install dependencies
+pip install -r apps/telegram-bot/requirements.txt
+
+# Run tests
+pytest
 
 # Run bot
-export JIGAIDO_BOT_TOKEN="test:token"
-python bot.py
+export JIGAIDO_BOT_TOKEN="your_bot_token"
+python -m apps.telegram-bot.bot
 ```
 
+## Architecture
+
+JIGAIDO follows hexagonal architecture:
+
+- **Core** (`core/`): Pure domain logic - models, ports (interfaces), and services
+- **Adapters** (`adapters/`): Infrastructure implementations - storage adapters
+- **Apps** (`apps/`): CLI applications - Telegram bot
+
 ## Code Style
 
-- Python (no strict formatter enforced yet)
+- Python 3.10+ with type hints
 - Async/await for Telegram handlers
-- Type hints where obvious
 - Docstrings for public functions
+- Follow existing code patterns
 
 ## Pull Request Workflow
 
 1. Branch from `main`
 2. Make changes
-3. Test locally
+3. Test locally with `pytest`
 4. Open PR with description of what changed and why
 5. Someone reviews and merges