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c20fc8a8 - [Rust Frontend] Let the handshake owner serve a range of DP ranks (#64450)

[Rust Frontend] Let the handshake owner serve a range of DP ranks (#64450) Signed-off-by: Bugen Zhao <i@bugenzhao.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>