docs(deployment): fix MongoDB credential placeholder in deployment guide

- Removed example MongoDB connection string with password
- Replaced with reference to MongoDB documentation for auth format
- Complies with inst_069/070 credential exposure prevention

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

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

docs/markdown/deployment-guide.md

@@ -47,7 +47,7 @@ npm --version
 
 ```bash
 # Clone the repository
-git clone https://github.com/AgenticGovernance/tractatus-framework.git
+git clone https://github.com/AgenticGovernance/tractatus-framework
 cd tractatus-framework
 
 # Install dependencies
@@ -629,8 +629,9 @@ mongo
   })
 > exit
 
-# Update MONGODB_URI with auth
-MONGODB_URI=mongodb://tractatus_admin:password@localhost:27017/tractatus_production
+# Update .env with authenticated MongoDB URI
+# See MongoDB documentation for connection string format with authentication
+# Store password in environment variable, never in code
 ```
 
 ### Firewall Configuration
@@ -722,7 +723,7 @@ NODE_OPTIONS=--max-old-space-size=4096 node src/server.js
 
 - **Implementation Guide**: See [Implementation Guide](/docs/implementation-guide) for integration patterns
 - **API Reference**: Visit `/api-reference.html` for complete API documentation
-- **GitHub Repository**: Access code examples at [tractatus-framework](https://github.com/AgenticGovernance/tractatus-framework)
+- **GitHub Repository**: Access code examples at https://github.com/AgenticGovernance/tractatus-framework
 
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