[Medium Priority] Expand integration test coverage

[Mossaka]

Context

From CI/CD Pipeline Gap Assessment (Discussion #227)

Description

Increase integration test coverage from current 7 test files to 15+ files, targeting 50%+ overall coverage.

Acceptance Criteria

• Expand integration tests to cover more scenarios
• Increase to 15+ integration test files
• Achieve 50%+ overall test coverage
• Document testing patterns and best practices
• Ensure tests are reliable and not flaky

Estimated Effort

To be determined (iterative work over Month 1)

Related

• Discussion CI/CD Pipeline and Integration Tests - Gap Assessment #227