feat(ksm): typed config — BoxConfig.ksm / InstanceSpec.ksm / pool start --ksm#25
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…rt --ksm KSM page-merging is now a first-class config field instead of an inherited env: BoxConfig.ksm → InstanceSpec.ksm → the controller sets A3S_BOX_KSM=1 on the shim (which does the prctl opt-in). `pool start --ksm` enables it for pooled same-image VMs — the highest-value case (measured 3.2× dedup). The A3S_BOX_KSM env still works as an override.
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KSM page-merging becomes a first-class config field instead of an inherited env:
BoxConfig.ksm→InstanceSpec.ksm→ the controller setsA3S_BOX_KSM=1on the shim (which does the prctl opt-in).pool start --ksmenables it for pooled same-image VMs — the highest-value case (3.2× dedup measured in #16). The env still works as an override.KVM-verified: with
pool start --ksm, the shim's env carriesA3S_BOX_KSM=1and its memory regions show themg(mergeable) VmFlag.