两个隔离工作区 · 可核对产物

diff --git a/filter.py b/filter.py
new file mode 100644
index 0000000..6b56518
--- /dev/null
+++ b/filter.py
@@ -0,0 +1,2 @@
+def filter_rows(rows, category):
+    return [r for r in rows if r["category"] == category]

diff --git a/import_preview.py b/import_preview.py
new file mode 100644
index 0000000..6784cc3
--- /dev/null
+++ b/import_preview.py
@@ -0,0 +1,2 @@
+def preview(rows):
+    return {"valid": [r for r in rows if r.get("sku")], "errors": [r for r in rows if not r.get("sku")]}

真实主工作区保持干净，只有README。临时工作区已由程序清理。