correctly track begin seqnum when resend range ends with admin messages#1270

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copilot/fix-order-matching-issue

Commits on Jun 29, 2026

fix: track newBegin inside resend loop to handle trailing admin messages
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Commits on Jun 30, 2026

test: add regression test for issue #344 and fix newBegin after trailing admin gap-fill
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fix+test: unify post-loop branch and add enableNextExpectedMsgSeqNum regression test
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