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Add block-volume snapshot support to the Supervisor (WCP) controller

Add block-volume snapshot support to the Supervisor (WCP) controller: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). The Supervisor-cluster CSI controller currently rejects every snapshot request: its CreateSnapshot and DeleteSnapshot entry points just return an…

The task

The Supervisor-cluster CSI controller currently rejects every snapshot request: its `CreateSnapshot` and `DeleteSnapshot` entry points just return an "unimplemented" gRPC error. We already support CSI snapshots for block volumes elsewhere in the driver; we now need the same lifecycle to work when the controller is…

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