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test(ec): pre-populate disks so multi-disk EC balance spread is deterministic The multidisk shard-loss regression asserts EC shards spread across more than one disk per node, but that only holds for disks the balancer can see. The master enumerates a physical disk only when it already holds a volume or EC shard — an empty disk leaves no trace, since heartbeats aggregate capacity per disk type, not per physical disk. So whether the post-encode balance spread shards depended on how the master happened to place the filler volumes across disks, which varies by environment: the test passed locally (shards on 5 disks) but produced one disk per node in CI and failed the "got 3 disks across 3 nodes" assertion. Grow a few volumes on each server before encoding so every physical disk holds a volume and is visible to the balancer. The volume server places each new volume on its least-loaded disk, so a handful of grows touches every disk, making the spread deterministic. The assertion still has teeth: it counts disks holding shard files, so a balancer that failed to spread would still collapse to one disk per node.