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Chris Lu
b872d5e683
* balance: extract the bytes-aware density metric to weed/topology/balancer The shell's volume.balance ranks servers by a bytes-aware density (used volume equivalents over free capacity). Move that math into the shared balancer package (VolumeDensity / DensityRatio / DensityNextRatio) so the maintenance worker can adopt the same metric next. Shell behavior is unchanged. * balance: rank a server with no free capacity as the fullest DensityRatio/DensityNextRatio divided by capacity, so a server past its slot limit (negative capacity) returned a negative ratio and sorted as the emptiest under ascending consumers — the opposite of reality. Treat any non-positive capacity (full, or overfull mid-run after receiving volumes) as the fullest (+Inf) so it is a move source, never a target. Covered by negative-capacity and ordering tests.