Suggest what tests should be added or updated for this change.

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Return:

1. Test Coverage Suggestions:
- List the highest-value tests to add or update
- Be specific about scenarios, assertions, and edge cases
- If existing coverage already looks sufficient, say so clearly

2. Risk Gaps:
- Call out the most important behaviors that could regress without tests

3. Suggested Test Plan:
- Organize the recommended tests by unit, integration, or end-to-end when appropriate
