docs: mention MCP tool alternative for enhance command in GEMINI.md (#772)

Add note that the enhance_project MCP tool call can be used as an
alternative to the CLI command for adding Terraform/CI-CD files.

Author: eliasecchig

agent_starter_pack/base_templates/python/GEMINI.md

@@ -841,6 +841,7 @@ Note: `setup-cicd` automatically initializes git if needed.
      --cicd-runner github_actions \
      -y -s
    ```
+   Or use the equivalent MCP tool call (`enhance_project`) if available.
 
 2. Ensure you're logged in to GitHub CLI:
    ```bash