Implement skipped error handling tests in Control API unit tests

[mattheworiordan]

Several error handling tests in the Control API unit test suite are currently skipped:

1. "should handle network errors" - Needs implementation for simulating network failures
2. "should retry transient failures" - Needs implementation for retry logic testing
3. "should respect retry limits" - Needs implementation for testing maximum retry attempts

These tests are important for ensuring the Control API client handles failures gracefully. They require setting up proper mocks for network conditions and retry logic.