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The Go volume server has VolumeConsolidateIndex, which moves a volume's .idx out of the data directory into the configured -dir.idx directory (where an EC decode/reconstruct can leave it co-located) and reloads the volume in place. The Rust port's proto omitted the RPC entirely, so its generated VolumeServer trait was one method short of Go's. Add the proto message and rpc, the gated grpc handler, and Store::consolidate_volume_index / Volume::relocate_index_to, mirroring Go's Store.ConsolidateVolumeIndex and Volume.RelocateIndexTo -- including the cross-device copy fallback and the reopen-against-the-old-dir path when the move fails. Integration tests cover the real move (index relocated, volume still serves reads and the move is idempotent), the no-op paths (index already in place, no separate idx dir) and the not-found error, plus the grpc handler end to end.