[Long-term] Implement test parallelization to reduce CI time

[Mossaka]

Context

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

Description

Parallelize test execution to reduce CI time by 30-50%. This improves developer feedback loops and reduces resource consumption.

Acceptance Criteria

• Analyze current test suite execution time
• Implement parallel test execution (e.g., Jest workers, parallel workflows)
• Achieve 30-50% reduction in CI time
• Ensure test isolation and reliability
• Document parallelization strategy

Estimated Effort

To be determined (quarterly goal)

Related

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