improvement(redis): strip idempotency body and cap mothership stream zsets #4625

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Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_4a2fc4f6-f27d-45dd-8329-725834112004

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit 78b3d96. Configure here.}