[WIP] Fix the failing GitHub Actions job Validate SDC (Quartus) Constraints

[Copilot]

• Inspect failing GitHub Actions run and job logs for Validate SDC (Quartus) Constraints
• Reproduce the validator behavior locally and identify root cause
• Implement the smallest possible fix in repository files
• Add or adjust focused validation/tests for the changed behavior
• Run targeted checks plus relevant existing validation commands
• Run security/quality validation and summarize final outcome