Fix first migration failure on new project setup

[fioreagui]

Description

Fix first migration failure after creating a new project and agent. Operations were generated in wrong dependency order and ExampleTool was commented out in the startproject template.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Refactoring (no functional changes)

Related Issues

Fixes #2

Changes Made

• Fixed entity iteration order in diff_states() to respect dependency chain: tools -> agents -> lessons/faqs/fixed_responses
• Uncommented ExampleTool in startproject template so new projects work out of the box with startagent
• Added try/except for __version__ import in makemigrations
• Added TestOperationOrdering test class with two tests verifying correct operation ordering

Testing Done

• Unit tests pass locally
• Added new tests for new functionality
• Tested manually

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes