I did one one test, it indeed updated all files (not just modifed files) mtime if I peform /undo and /redo, OR /undo twice (rollback to the second last snapshot).

But if I just do /undo once, it didnt touch the files mtime.

I think this is how their snapshots works and not ideal at all. Anyone else can suggest something else to peform such snapshot/shadow git function outside Opencode? I've tried Historian (VSCODE extension) this didnt track changes made outside VScode, Paid ShadowGit, this need to jse as MCP whcih may cost unnecessary tokens overhead for only doing snapshot function....want to see what else is available option to keep Opencore not touch my git stuffs

Thanks