feat: resolve unbound variables

[xing-yiren]

Description

Fix "unbound variable" error for final_reviewers via explicit empty array initialization

Changes

Fix "unbound variable" error for final_reviewers via explicit empty array initialization

Testing & Benchmark

Checklist

• Read and followed the Contributing Guidelines.
• Self-tested locally to ensure the code runs correctly and achieves expected results (all CI checks expected to pass).
• Updated documentation if needed.
• Verified accuracy or performance benchmarks if applicable.

Reviewers