Fix Gemma 4 vLLM startup and improve partial-provisioning UX

- provisioning.rb: auto-install pytest before pre_start_cmd to fix missing
dependency in nightly vLLM images that crashes EngineCore on cupy import
- cli.rb: relax active_config_loaders/vm1_alive? to match by vm_id+public_ip
instead of requiring status==ACTIVE, so watch/status/test work on VMs
that were interrupted mid-provisioning
- vm_lifecycle.rb: persist API status/vm_state back to state file during
status calls; add 'Provisioning: incomplete' notice when provisioned_at
is missing
- provisioning_orchestrator.rb: add wait_for_ssh polling before
ensure_trusted_host to fix race between SSH daemon readiness and keyscan

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