[bot] Update /rewind docs to reflect v1.0.78 improvements (no git required, file restore option)

[DanWahlin]

What changed in Copilot CLI

In v1.0.78 (2026-08-03), the /rewind command received a meaningful upgrade:

/rewind no longer requires git and restores only the files Copilot changed, skipping any file whose contents no longer match what Copilot last wrote, with a conversation-only or conversation + files choice.

This is beginner-relevant because:

• Beginners often work outside of git repositories, so removing the git requirement makes /rewind accessible to more learners.
• The new "conversation-only vs conversation + files" choice gives learners more precise control when undoing Copilot's work.

What was updated

File	Change
01-setup-and-first-steps/README.md	Updated the /rewind row in the slash commands reference table to mention the file restore option and that git is not required.
02-context-conversations/README.md	Updated the /rewind tip callout to describe the new conversation-only vs conversation + files choice, and noted that no git repository is needed. Also updated the Context Efficiency Tips table entry.

Source

• Changelog: https://github.com/github/copilot-cli/blob/main/changelog.md — entry for 1.0.78 (2026-08-03)

Note: The other changes in v1.0.78 (browser login flow, /permissions, /plugins) were already covered in PR #197, merged 2026-08-04. This PR addresses only the /rewind improvement that was missed.

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