Keep acknowledgements monotonic and follower commits bounded

Review the independently proposed patch below, including its unchanged callers. Out-of-order acknowledgements must not decrease a peer match index. A follower must separately cap a heartbeat commit at its last newly confirmed index, not an unconfirmed local tail.

Review focus: Consensus log transitions

src/services/acknowledgements.go

BeforeProposed

+1−1

55)

77func Remember(node *models.Node, peer string, match int) {

8 node.Matches[peer] = match

8 node.Matches[peer] = models.Maximum(node.Matches[peer], match)

99}

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