Add CLAUDE.md project guide for Claude Code

Create comprehensive project documentation including:
- Project overview and core functionality
- Tech stack and dependencies
- Project structure breakdown
- Key components and message flow
- Development guidelines and common commands

CLAUDE.md

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+# CLAUDE.md - Project Guide for Claude Code
+
+## Project Overview
+
+**Eugen** is an intelligent Twitch chat bot for gaming and 3D printing topics. The bot uses the Perplexity Sonar API for AI-powered responses and features persistent conversation memory per user.
+
+### Core Functionality
+- Responds when mentioned in chat (@Eugen, Eugen:, etc.)
+- Maintains conversation history per user (max 25 messages)
+- Integrates with Perplexity API for intelligent responses
+- Provides a GUI dashboard for live monitoring
+
+### Primary Topics
+- **Gaming**: World of Warcraft, Elden Ring, Gamedev
+- **3D Printing**: Prusa i3, Bambu, Creality
+- **Tech**: Python, Linux, Home Automation
+
+## Tech Stack
+
+- **Language**: Python 3.9+ (recommended 3.11+)
+- **AI Provider**: Perplexity API (sonar-pro model)
+- **Chat Protocol**: Twitch IRC
+- **GUI Framework**: PySimpleGUI
+- **Platform**: Windows-native (no Linux tools required)
+
+## Project Structure
+
+```
+eugen/
+├── chatbot.py              # Main entry point
+├── config.py               # Configuration management
+├── gui.py                  # Dashboard GUI
+├── ai_provider.py          # Perplexity API integration
+├── memory.py               # Conversation memory storage
+├── utils.py                # Helper functions (MentionDetector, Logger)
+├── requirements.txt        # Python dependencies
+├── .env                    # Secrets (DO NOT COMMIT)
+│
+├── data/
+│   ├── conversations/      # Per-user chat histories (*.json)
+│   └── config.json         # Saved configuration
+│
+└── logs/
+    ├── eugen.log           # Main log file
+    └── api_debug.log       # API debug logs
+```
+
+## Key Components
+
+### Classes
+- `EugenBot` - Main orchestrator for IRC, Memory, AI, and GUI
+- `MentionDetector` - Detects bot mentions in chat messages
+- `ConversationMemory` - Stores/loads chat history per user
+- `PerplexityProvider` - Handles Perplexity API communication
+- `Dashboard` - PySimpleGUI-based live monitoring interface
+- `Config` - Loads configuration from .env and config.json
+
+### Message Flow
+1. Chat message received via IRC
+2. MentionDetector checks if bot was addressed
+3. ConversationMemory loads user's last 5 messages
+4. Prompt built with system prompt + history + current message
+5. API call to Perplexity Sonar
+6. Response saved to memory and sent to chat
+7. Dashboard updated with event
+
+## Development Guidelines
+
+### Dependencies
+```
+perplexity-python-client==1.0.0
+irc==20.1.0
+python-dotenv==1.0.0
+PySimpleGUI==4.60.0
+requests==2.31.0
+httpx  # For async API calls
+```
+
+### Environment Variables (.env)
+```
+TWITCH_OAUTH_TOKEN=oauth:xxxxx
+TWITCH_BOT_NICKNAME=Eugen
+TWITCH_CHANNEL=#channel_name
+PERPLEXITY_API_KEY=pplx-xxxxx
+PERPLEXITY_MODEL=sonar-pro
+MAX_TOKENS=450
+DEBUG_MODE=true
+```
+
+### Important Notes
+- Never commit .env or files containing API keys
+- User conversation files are stored as JSON in data/conversations/
+- Context retention is limited to 1 hour by default
+- Max tokens for responses: 450 (Twitch chat limit consideration)
+
+## Common Commands
+
+```bash
+# Setup virtual environment
+python -m venv venv
+.\venv\Scripts\Activate.ps1  # Windows PowerShell
+
+# Install dependencies
+pip install -r requirements.txt
+
+# Run the bot
+python chatbot.py
+```
+
+## Testing API Keys
+
+- **Twitch**: Test IRC connection to irc.chat.twitch.tv:6667
+- **Perplexity**: POST to https://api.perplexity.ai/chat/completions with a simple test message
+
+## Error Handling
+
+Common issues:
+- Invalid Twitch Token: Regenerate at twitchtokengenerator.com
+- Perplexity API 401: Check API key validity and account credits
+- IRC Connection Failed: Check firewall rules for port 6667
+- Rate Limiting: Built-in auto-retry after 60 seconds
+
+## Language Note
+
+This project's documentation (eugen_claude.md) is in German. The bot is designed for German-speaking Twitch communities but can be adapted for other languages.