Add Undo Command to CLI

[BDVRTribe]

Summary

Add CLI support for undoing the last action through a --undo flag that calls undo_last_action().

Tasks

• Add CLI flag: --undo or undo
• Connect to undo_last_action() function
• Output the action being reversed
• Log the undo event via log_event()
• Validate behavior through manual CLI tests

Outcome

Users can easily reverse their last command without needing to browse logs manually.