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I want EliasDB's graph Manager to expose a stateful node-key iterator for scanning the keys of stored nodes…

I want EliasDB's graph Manager to expose a stateful node-key iterator for scanning the keys of stored nodes…: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). Given a manager with nodes key=123, kind=mykind , key=789, kind=mykind , and key=456, kind=mykind2 stored…

The task

Given a manager with nodes `key=123, kind=mykind`, `key=789, kind=mykind`, and `key=456, kind=mykind2` stored in partition `main`, calling `gm.NodeKeyIterator("main", "mykind")` should return a non-nil iterator and nil error. Repeatedly calling `HasNext()` and `Next()` should yield only the node keys for that kind,…

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.