ci(observability): verify CSS mirror instead of mutating runner

scripts/quick_review.sh

@@ -83,7 +83,7 @@ run_observability_css_sync() {
     fi
 
     echo -e "${GREEN}🎨 同步 AI觀測台 CSS 到 Flask static path...${NC}"
-    python3 "$OBSERVABILITY_CSS_SYNC"
+    python3 "$OBSERVABILITY_CSS_SYNC" "$@"
 }
 
 # 非互動入口：給部署腳本、CI、或 Codex session 直接呼叫。
@@ -106,7 +106,12 @@ if [ $# -gt 0 ]; then
             ;;
         --sync-observability-css)
             shift
-            run_observability_css_sync
+            run_observability_css_sync "$@"
+            exit $?
+            ;;
+        --check-observability-css)
+            shift
+            run_observability_css_sync --check
             exit $?
             ;;
         --observability-help)
@@ -114,6 +119,8 @@ if [ $# -gt 0 ]; then
 AI observability quick-review flags:
   --sync-observability-css
       Sync static/css/observability-system.css to web/static/css mirror.
+  --check-observability-css
+      Verify CSS mirror is already committed and in sync.
   --observability-ui
       Run static UI/template/navigation guard only.
   --observability-smoke [--base-url URL] [--timeout SEC]