Add agentic workflow daily-test-improver (#4705)

Author: yomybaby

.github/aw/actions-lock.json

@@ -0,0 +1,9 @@
+{
+  "entries": {
+    "actions/checkout@v5": {
+      "repo": "actions/checkout",
+      "version": "v5",
+      "sha": "93cb6efe18208431cddfb8368fd83d5badbf9bfd"
+    }
+  }
+}