feat: Add comprehensive dynamic configuration system v3.3.0

## Major Features Added

### 🎯 Dynamic Configuration System
- **Environment-aware model selection**: DEFAULT_MODEL with 'pro'/'flash' shortcuts
- **Configurable thinking modes**: DEFAULT_THINKING_MODE_THINKDEEP for extended reasoning
- **All tool schemas now dynamic**: Show actual current defaults instead of hardcoded values
- **Enhanced setup workflow**: Copy from .env.example with smart customization

### 🔧 Model & Thinking Configuration
- **Smart model resolution**: Support both shortcuts ('pro', 'flash') and full model names
- **Thinking mode optimization**: Only apply thinking budget to models that support it
- **Flash model compatibility**: Works without thinking config, still beneficial via system prompts
- **Dynamic schema descriptions**: Tool parameters show current environment values

### 🚀 Enhanced Developer Experience
- **Fail-fast Docker setup**: GEMINI_API_KEY required upfront in docker-compose
- **Comprehensive startup logging**: Shows current model and thinking mode defaults
- **Enhanced get_version tool**: Reports all dynamic configuration values
- **Better .env documentation**: Clear token consumption details and model options

### 🧪 Comprehensive Testing
- **Live model validation**: New simulator test validates Pro vs Flash thinking behavior
- **Dynamic configuration tests**: Verify environment variable overrides work correctly
- **Complete test coverage**: All 139 unit tests pass, including new model config tests

### 📋 Configuration Files Updated
- **docker-compose.yml**: Fail-fast API key validation, thinking mode support
- **setup-docker.sh**: Copy from .env.example instead of manual creation
- **.env.example**: Detailed documentation with token consumption per thinking mode
- **.gitignore**: Added test-setup/ for cleanup

### 🛠 Technical Improvements
- **Removed setup.py**: Fully Docker-based deployment (no longer needed)
- **REDIS_URL smart defaults**: Auto-configured for Docker, still configurable for dev
- **All tools updated**: Consistent dynamic model parameter descriptions
- **Enhanced error handling**: Better model resolution and validation

## Breaking Changes
- Removed setup.py (Docker-only deployment)
- Model parameter descriptions now show actual defaults (dynamic)

## Migration Guide
- Update .env files using new .env.example format
- Use 'pro'/'flash' shortcuts or full model names
- Set DEFAULT_THINKING_MODE_THINKDEEP for custom thinking depth

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.env.example

@@ -5,10 +5,22 @@
 # Get your API key from: https://makersuite.google.com/app/apikey
 GEMINI_API_KEY=your_gemini_api_key_here
 
-# Optional: Redis connection URL for conversation memory
-# Defaults to redis://localhost:6379/0
-# For Docker: redis://redis:6379/0
-REDIS_URL=redis://localhost:6379/0
+# Optional: Default model to use
+# Full names: 'gemini-2.5-pro-preview-06-05' or 'gemini-2.0-flash-exp'
+# Defaults to gemini-2.5-pro-preview-06-05 if not specified
+DEFAULT_MODEL=gemini-2.5-pro-preview-06-05
+
+# Optional: Default thinking mode for ThinkDeep tool
+# NOTE: Only applies to models that support extended thinking (e.g., Gemini 2.5 Pro)
+#       Flash models (2.0) will use system prompt engineering instead
+# Token consumption per mode:
+#   minimal: 128 tokens   - Quick analysis, fastest response
+#   low:     2,048 tokens - Light reasoning tasks  
+#   medium:  8,192 tokens - Balanced reasoning (good for most cases)
+#   high:    16,384 tokens - Complex analysis (recommended for thinkdeep)
+#   max:     32,768 tokens - Maximum reasoning depth, slowest but most thorough
+# Defaults to 'high' if not specified
+DEFAULT_THINKING_MODE_THINKDEEP=high
 
 # Optional: Workspace root directory for file access
 # This should be the HOST path that contains all files Claude might reference