Fix corrupted emoji in EVALUATION_SUMMARY.md

- Replace corrupted emoji character with proper UTF-8 target emoji
- Address code review feedback

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

EVALUATION_SUMMARY.md

@@ -8,7 +8,7 @@
 
 ---
 
-## �� Key Understanding / 核心认识
+## 🎯 Key Understanding / 核心认识
 
 **Critical Architecture Clarification / 关键架构澄清:**