fix(router): keyword match tiebreaker should preserve list order, not alphabetical

src/agentkit/router/intent.py

@@ -101,8 +101,8 @@ class IntentRouter:
         if not candidates:
             return None
 
-        # 按得分降序排序，得分相同时按 skill 名称字母序稳定排序
-        candidates.sort(key=lambda c: (-c[2], c[0].name))
+        # 按得分降序排序；得分相同时保持列表顺序（Python sort 稳定）
+        candidates.sort(key=lambda c: -c[2])
         best_skill, best_kws, _best_score = candidates[0]
         confidence = min(1.0, 0.5 + 0.1 * len(best_kws))