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M7: Nil out trailing *connectionEntry pointers in the backing array after slice removal in removeConnectionAtIndexLocked and send(). Without this, the GC cannot collect removed entries until the slice is reallocated. M1: Initialize the done channel in NewBatcher instead of Start(). Previously, calling Close() or queueWork before Start() would select on a nil channel, blocking forever. Moving the make() to the constructor ensures the channel is always usable. M2: Move b.connected.Delete and b.totalNodes decrement inside the Compute callback in cleanupOfflineNodes. Previously these ran after the Compute returned, allowing a concurrent AddNode to reconnect between the delete and the bookkeeping update, which would wipe the fresh connected state. M3: Call markDisconnectedIfNoConns on AddNode error paths. Previously, when initial map generation or send timed out, the connection was removed but b.connected retained its old nil (= connected) value, making IsConnected return true for a node with zero connections. Updates #2545