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Module watermark

Module watermark 

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DAG-native watermark tracking.

Provides Vec-indexed O(1) watermark propagation through a DAG topology. Watermarks flow from source nodes downstream using min-semantics at fan-in (merge) nodes, matching the global watermark tracking pattern but scoped to DAG nodes.

§Ring 0 Compatibility

All operations use pre-allocated Vec<T> indexed by NodeId.0 for zero-allocation lookups, consistent with DagExecutor.

Structs§

DagWatermarkCheckpoint
Checkpoint state for DagWatermarkTracker.
DagWatermarkTracker
Vec-indexed O(1) watermark tracker for DAG pipelines.