Test Type: Y-Stream Upgrade Regression Testing

Version: ACM 2.15.1

Upgrade Path: ACM 2.14.x → 2.15.1

Test Scope:
- Y-stream upgrade validation
- Feature compatibility verification
- Post-upgrade functionality testing

Purpose:
This task tracks regression testing for Y-stream upgrade from ACM 2.14.x to ACM 2.15.1, ensuring smooth upgrade path and feature stability across minor version changes.

Note: This task and its content were generated by Claude Code AI assistant.