- bufferCozeRowsOrMerge: unified DONE result persist entry point; buffers to
transient storage when toggle on, falls back to immediate chunk merge on
failure (result never lost), no-op on empty input
- submit/retry synchronous immediate DONE results now buffer too (previously
always merged immediately); submit path persists a DONE scope state row to
carry the buffer pointer (persistImmediateCozeDoneState)
- poll path drops the batchTotal>1 gate: single-batch tasks also buffer
- CozeCandidate/CozeBatchContext records package-private for test access
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