diff --git a/client/analysis_options.yaml b/client/analysis_options.yaml
index 42005a3..b7fde76 100644
--- a/client/analysis_options.yaml
+++ b/client/analysis_options.yaml
@@ -5,8 +5,17 @@ analyzer:
   # 噪音淹没自身 issue,让 analyze 闸形同虚设)。
   exclude:
     - packages/lucide_icons_patched/**
+  # 支柱4(错误是有类型的值)提升为 error 级真守门:即使 CI 用 --no-fatal-infos,
+  # 这两条仍致命(违规挡 merge)。当前零违规。
+  errors:
+    only_throw_errors: error
+    avoid_catching_errors: error
 
 linter:
   rules:
     prefer_const_constructors: false
     prefer_const_literals_to_create_immutables: false
+    # 支柱4(错误是值):只抛 Error/Exception(不抛字符串/任意对象);不 catch Error
+    # (程序错误应让其崩、不该被吞)。详见 docs/dev-conventions.html。
+    only_throw_errors: true
+    avoid_catching_errors: true