fix: hook scripts misread ruff success banner as a lint issue

ruff check prints 'All checks passed!' on success, which the non-empty
output test counted as one problem and blocked every commit. Use
--quiet --output-format concise so success is silent and each
diagnostic is exactly one line.

.claude/scripts/hooks/pre-commit-guard.sh

@@ -33,7 +33,8 @@ for CODE_DIR in "${CODE_DIRS[@]}"; do
 
     # ── 1. 全量代码质量检查 ──
     if command -v ruff &> /dev/null; then
-        RUFF_OUTPUT=$(ruff check "$CODE_DIR" 2>&1 || true)
+        # --quiet: 成功时零输出(避免把 "All checks passed!" 误判为问题),失败时只打印诊断行
+        RUFF_OUTPUT=$(ruff check --quiet --output-format concise "$CODE_DIR" 2>&1 || true)
         if [[ -n "$RUFF_OUTPUT" ]]; then
             ERROR_COUNT=$(echo "$RUFF_OUTPUT" | wc -l)
             ERRORS+="[ruff] $CODE_DIR/ 中有 ${ERROR_COUNT} 个问题。运行 ruff check $CODE_DIR/ 查看详情。\n"