Feature: Add undo/revert functionality for AI actions

[Rhiz3K]

Feature Request

Add the ability to undo/revert AI-generated changes, similar to functionality already implemented in other AI-centric CLI tools.

Prior Art

Other AI-centric CLI tools implement this feature as follows:

• OpenCode: /undo removes the last message and reverts file changes.
• Claude Code: /rewind opens an interactive menu to revert Code, Conversation, or Both.
• Gemini CLI: /restore uses automated snapshots to roll back to a previous "checkpoint."
• Codex-CLI: /undo relies on "ghost commits" to revert the working directory.

Motivation

Users should be able to safely revert changes made by the AI assistant when the result is not what they expected. This is a common pattern across AI coding tools and improves user confidence in letting the AI make changes.

[BowgartField]

#25

[gianpieropa]

Yes this would be very helpful