docs: Fix DEFAULT_MODEL documentation to reflect actual default behavior

The documentation incorrectly stated that DEFAULT_MODEL defaults to gemini-2.5-pro-preview-06-05,
when in fact config.py defaults to 'auto' mode if the environment variable is not set. Updated
the table to clarify that the server uses 'auto' mode (Claude picks best model) when no
DEFAULT_MODEL env var is provided to the Docker container.

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

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

README.md

@@ -163,18 +163,13 @@ please exit and start a new session.
 
 #### Option A: Local Development Setup (using local Docker build)
 
-The setup script shows you the exact configuration for local development:
+If you ran `./setup-docker.sh`, it provided you with the exact configuration for local development.
-#### If Setting up for Claude Desktop
 
-- Open Claude Desktop
+**Steps:**
-- Go to **Settings** → **Developer** → **Edit Config**
+1. **Open Claude Desktop** → **Settings** → **Developer** → **Edit Config**
+   - This opens a folder revealing `claude_desktop_config.json`
 
-This will open a folder revealing `claude_desktop_config.json`.
+2. **Add the configuration** shown by setup script (or copy from below):
-
-2. ** Update Docker Configuration**
-
-The setup script shows you the exact configuration. It looks like this. When you ran `setup-docker.sh` it should
-have produced a configuration for you to copy:
 
 ```json
 {
@@ -256,26 +251,43 @@ You can customize the server behavior by adding additional environment variables
 | Environment Variable | Default Value | Description |
 |---------------------|---------------|-------------|
 | `GEMINI_API_KEY` | *Required* | Your Google AI Studio API key |
-| `DEFAULT_MODEL` | `gemini-2.5-pro-preview-06-05` | Default model: `gemini-2.5-pro-preview-06-05` (Pro) or `gemini-2.0-flash-exp` (Flash) |
+| `DEFAULT_MODEL` | `auto` (if not set) | Model selection: `auto` (Claude picks best model), `gemini-2.5-pro-preview-06-05` (Pro), or `gemini-2.0-flash-exp` (Flash) |
 | `DEFAULT_THINKING_MODE_THINKDEEP` | `high` | Default thinking depth: `minimal`, `low`, `medium`, `high`, `max` |
 | `LOG_LEVEL` | `INFO` | Logging verbosity: `DEBUG`, `INFO`, `WARNING`, `ERROR` |
 | `MCP_PROJECT_ROOT` | *Home directory* | Restrict file access to specific project directory |
 | `REDIS_URL` | `redis://localhost:6379/0` | Redis connection for conversation threading |
 
-**Examples:**
+**Examples for Claude Desktop config:**
+
+```json
+{
+  "mcpServers": {
+    "gemini": {
+      "command": "docker",
+      "args": [...],
+      "env": {
+        "GEMINI_API_KEY": "your-key",
+        "DEFAULT_MODEL": "gemini-2.0-flash-exp",
+        "DEFAULT_THINKING_MODE_THINKDEEP": "medium", 
+        "LOG_LEVEL": "DEBUG",
+        "MCP_PROJECT_ROOT": "/Users/yourusername/my-project"
+      }
+    }
+  }
+}
+```
+
+**Examples for direct docker run:**
 
 ```bash
 # Use faster Flash model by default
-"DEFAULT_MODEL": "gemini-2.0-flash-exp"
+docker run -e DEFAULT_MODEL="gemini-2.0-flash-exp" ghcr.io/beehiveinnovations/zen-mcp-server:v4.0.10
 
-# Use lower thinking mode to save tokens
+# Use lower thinking mode to save tokens  
-"DEFAULT_THINKING_MODE_THINKDEEP": "medium"
+docker run -e DEFAULT_THINKING_MODE_THINKDEEP="medium" ghcr.io/beehiveinnovations/zen-mcp-server:v4.0.10
 
 # Enable debug logging for troubleshooting
-"LOG_LEVEL": "DEBUG"
+docker run -e LOG_LEVEL="DEBUG" ghcr.io/beehiveinnovations/zen-mcp-server:v4.0.10
-
-# Restrict file access to your project directory
-"MCP_PROJECT_ROOT": "/Users/yourusername/my-project"
 ```
 
 **Benefits of using published image:**
@@ -1010,13 +1022,6 @@ python tests/test_live_integration.py
 - **[Test Structure Analysis](docs/contributing/test-structure.md)** - Detailed analysis of existing 17-file test suite
 - **[Development Workflows](docs/contributing/workflows.md)** - Testing integration with git processes
 
-# Run all unit tests
-python -m pytest tests/ -v
-
-# Run with coverage
-python -m pytest tests/ --cov=. --cov-report=html
-```
-
 ### Simulation Tests (API Key Required)
 To test the MCP server with comprehensive end-to-end simulation: