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57070680a5
Move per-node pending changes from a shared xsync.Map on the batcher into multiChannelNodeConn, protected by a dedicated mutex. The new appendPending/drainPending methods provide atomic append and drain operations, eliminating data races in addToBatch and processBatchedChanges. Add sync.Once to multiChannelNodeConn.close() to make it idempotent, preventing panics from concurrent close calls on the same channel. Add started atomic.Bool to guard Start() against being called multiple times, preventing orphaned goroutines. Add comprehensive concurrency tests validating these changes.