google / alioth / 36457055736

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fix(board): reject a CPU spec with zero vCPUs

With `--cpu count=0`, parse_cpu_arg() derives 0 cores per socket, so
the topology adds up to the requested count and CpuSpec::validate()
accepts it. Alioth then creates a VM without any vCPU, which never
runs and never exits, and prints nothing.

Reject a count of 0 in CpuSpec::validate() so that Board::new() fails
with "Invalid CPU topology" before the VM is created.

Assisted-by: Claude-Code:Claude-Opus-5.5
Signed-off-by: Philip Taron <philip.taron@gmail.com>

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