[teamleaderleo]

Summary

Restore Split Right and Split Down to the pane ellipsis menu. The agent composer header menu remains split-free; its split controls remain on the dedicated header actions, keyboard bindings, and drag targets.

Changelog

Fixed: restore pane ellipsis Split Right and Split Down actions.

Verification

• git diff --check
• Confirmed the composer ChatHeaderTools menu rows contain no split actions.
• No new unit test added per cmux-next policy; hosted Swift CI is the landing gate.

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Summary by cubic

Restores the Split Right and Split Down actions to the pane ellipsis menu.

• Removes the filter that excluded these actions for new tabs.
• The agent composer header menu is unchanged; its split controls remain on the dedicated header actions, keyboard bindings, and drag targets.

^{Written for commit 402c7e8. Summary will update on new commits.}

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[github-actions]

Not verified: macOS jobs did not run: compile and app tests were skipped on 402c7e8e89; ci-status is green without them.

CI passes on 402c7e8e89 (run 38344401208 attempt 1).
macOS jobs did not run: compile and app tests were skipped: Fast static checks skipped (the macos job needs both to succeed). Re-run CI once they pass, before merging.

Written by scripts/ci/classify_failures.py (ci-failure-attribution.yml); signatures are its SIGNATURES table. A machine verdict is the runner's fault, not this PR's; yours means the failing file is one this PR changes, also red on main that main's latest full suite fails the same way, seen on other PRs that it failed on another pull request's run lately.