Fix integration tests after process_hook API change

[memyselfandm]

The integration tests in test_integration_e2e.py are failing because:

1. They were calling process_hook() but the method is now process_hook_data()
2. After fixing the method name, tests expect a continue field but process_hook_data returns a different format

The method names have been fixed in commit but the return format expectations need updating.

Tests affected:

• test_integration_e2e.py (all tests)
• test_performance_100ms.py (if it exists in your branch)

Related to PR #1 review feedback.