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6631fde35f
Mark the last non-empty FILE_DATA payload with BEGIN and END when the producer knows it is terminal. Complete producer bookkeeping in the following fileDataEnd call without consuming another LGMP grant. Keep the standalone terminal record for empty and legacy unknown streams. Drain up to 64 queued clipboard records per worker pass instead of sleeping after every message. Poll at 1 ms while transfers, blocked writes, held input, or pending output are active, and retain the 10 ms interval while idle. This removes a serialized grant round trip from every non-empty file response and reduces scheduling delay while a large transfer is active. Keep the 1 MiB payload size because the bottleneck was stop-and-wait latency, not the chunk capacity. Exercise a full 1 MiB response in a single BEGIN|END grant and retain coverage for empty unknown-size responses.