[FLINK-39680][FLINK-21378] Supports unaligned checkpoint on pointwise edges#28523

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pltbkd:unaligned-cp-forward-edges-v2

Commits on Jun 24, 2026

[FLINK-39680][runtime] Support unaligned checkpoint on forward edges with force-unaligned option
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[FLINK-21378][runtime] Add PointwiseChannelMappingUtils with topology-aware computation helpers
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[FLINK-21378][runtime] Persist EdgeDistributionPattern into checkpoint MasterState
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[FLINK-21378][runtime] Add scalar topology fields to InflightDataGateOrPartitionRescalingDescriptor
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[FLINK-21378][runtime] Implement JM-side POINTWISE subtask assignment and restore path
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[FLINK-21378][runtime] Implement TM-side POINTWISE channel state recovery and demultiplexing
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[FLINK-21378][runtime] Add integration tests for POINTWISE rescaling descriptor generation
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