From ff1171a9f52e18913a190f747ab1450e45e99a20 Mon Sep 17 00:00:00 2001
From: pjh456 <147148383@qq.com>
Date: Sat, 26 Sep 2026 09:49:36 +0000
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---
 CONTRIBUTING.md | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index e424cb8f..9e7180aa 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -21,3 +21,21 @@ feat: Temporal.PlainTime round 舍入（真因子校验 + 跨午夜取模）
 fix: 闭包链式捕获越界改编译错误早暴露防静默错值
 perf: 字符串拼接消除冗余拷贝
 ```
+
+## 构建产物清理
+
+`target/` 是生成物，不提交。磁盘紧张时按以下入口清理：
+
+- 彻底清理（下次构建全量重编）：
+
+  ```bash
+  cargo clean
+  ```
+
+- 定向清理陈旧测试二进制（免全量重链接）：
+
+  ```bash
+  find target/debug/deps -maxdepth 1 -type f -name '*_tests*' ! -newer target/debug/test262-runner -delete
+  ```
+
+  以 runner 二进制 mtime 为界，只删早于最近一次构建的测试二进制；删除须先于任何构建动作，否则 runner 刷新后陈旧面会扩大。