chore(changeset): add changeset for undo

Author: juliangoetze

.changeset/hot-rules-enter.md

@@ -0,0 +1,9 @@
+---
+"@stagewise/agent-client": minor
+"@stagewise/toolbar": minor
+"@stagewise/agent-tools": minor
+"@stagewise/agent-types": minor
+"stagewise": minor
+---
+
+Implement undo functionality - it is now possible to restore a checkpoint and revert all file modifications to this point.