Prune older installed versions — keep only the latest three (including the live one) #5077

Concern

Copilot CLI does not appear to remove its older versions/copies. Over time these stale background copies accumulate instead of being cleaned up.

Request

Please make Copilot CLI retain only the latest three copies — including the live (currently running) one — and automatically remove all older background copies. This could be done:

• automatically on update/startup (prune anything beyond the latest three), or
• via a cleanup/prune command or setting (e.g. copilot --prune / a configurable retention count).

Notes

• I have not pinned down the exact on-disk location where the older copies accumulate; maintainers, please confirm where versioned copies are stored so retention can be applied there.
• Keeping a small number (three) rather than just one preserves a rollback fallback while bounding disk usage.