docs: update tool list and add HTTP mode beta warnings

- Added missing `start_here_workflow_guide` tool to Core Tools list
- Added beta warnings for HTTP mode in two places:
  - Option 3: Remote Server (Beta)
  - Production Deployment section
- Tool list now accurately reflects all 13 available tools
- Clear warning that HTTP mode is under development and not thoroughly tested

This ensures users are aware of the experimental nature of HTTP mode
while still providing the functionality for those who need it.

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

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

README.md

@@ -106,6 +106,7 @@ Add this to your Claude Desktop config:
 Once connected, Claude can use these powerful tools:
 
 ### Core Tools
+- **`start_here_workflow_guide`** - Essential guide and best practices (START HERE!)
 - **`list_nodes`** - List all n8n nodes with filtering options
 - **`get_node_info`** - Get comprehensive information about a specific node
 - **`get_node_essentials`** - Get only essential properties with examples (95% smaller)
@@ -165,7 +166,9 @@ If you prefer running locally:
 }
 ```
 
-### Option 3: Remote Server
+### Option 3: Remote Server (Beta)
+⚠️ **Note**: HTTP mode is under development and not thoroughly tested. Use with caution.
+
 For team deployments:
 
 ```json
@@ -235,7 +238,9 @@ npm run dev:http       # HTTP dev mode
 
 ## 🚀 Production Deployment
 
-### HTTP Server for Teams
+### HTTP Server for Teams (Beta)
+
+⚠️ **Note**: HTTP mode is under development and not thoroughly tested. Use with caution in production.
 
 Deploy n8n-MCP as a shared service: