diff --git a/.gitignore b/.gitignore
index b711600..e05c16f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,7 +11,11 @@ build/
 .venv/
 venv/
 
-# ── CRUD 构建产物（xls2ui 由 json/*.json 生成，只读、不入库；按 alias 逐条列，禁通配符）──
-# 宿主 apps/pbls/build.sh 以 wwwroot/{alias} 软链方式挂载，生成目录本身不进模块仓库。
+# one-off patch / scratch tooling dir: never commit (repo hygiene, QC#11)
+.scratch_m5a/
+
+# CRUD build output (generated by xls2ui from json/*.json; read-only, not tracked;
+# listed per alias, no wildcards). Host apps/pbls/build.sh mounts these as symlinks
+# under wwwroot/{alias}, so the generated dirs must not live in the module repo.
 wwwroot/pbl_artifact/
 wwwroot/pbl_evidence/