testdata: seed sandbox clean base

roodboi · roodboi · commit 77a45b2d142d · 2026-03-26T13:53:40.000-04:00
diff --git a/_test_data/sandbox/clean/base.txt b/_test_data/sandbox/clean/base.txt
@@ -1,3 +1,3 @@
 clean stack: base branch
 purpose: baseline parent PR
-marker: 549891f
+marker: 00e3fde
