[FEATURE]:rewind function in opencode

[JCwinning]

Feature hasn't been suggested before.

• [x] I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

the current /undo command only can undo the last message. how could we rewind to previous stage. for example 3 message before. like /rewind in claude code which allow user to select historical stage.

[github-actions[bot]]

This issue might be a duplicate of existing issues. Please check:

• #3071: /timeline UX is confusing (discusses rewinding to previous message in history similar to Claude Code's behavior)

Feel free to ignore if this doesn't address your specific case.

[JCwinning]

/timeline function did not restore the code change from my testing, it print out the prompt message only, but the code modification did not rewind

[laotoutou]

/rewind should be a basic feature, it's surprising that opencode doesn't have it.