fix: show original session command after fork

[kermanx]

Related Issue

No linked issue; this addresses a small TUI clarity gap in the fork flow.

Problem

After running /fork, the TUI switches into the forked session and only shows the new session id. Users who want to return to the pre-fork session need the exact resume command for the original session.

What changed

• Include kimi -r <original-session-id> in the successful fork status message after switching to the forked session.
• Update the existing fork flow test to assert the return command.
• Add a patch changeset for the CLI package.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: 9d2907c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

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