fix: Resolve o3-pro test isolation issues and convert print to logging

- Fix test isolation by clearing LOCALE env var in o3-pro test
- Add restriction service cleanup in test_model_restrictions.py
- Fix PII sanitizer phone regex to not match timestamps
- Convert all print statements to logging in test files per PR review
- Re-record o3-pro cassette with correct environment

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/test_model_restrictions.py

@@ -694,6 +694,6 @@ class TestAutoModeWithRestrictions:
             registry._initialized_providers.clear()
             registry._providers.update(original_providers)
             registry._initialized_providers.update(original_initialized)
-            
+
             # Clear the restriction service to prevent state leakage
             utils.model_restrictions._restriction_service = None