* feat: add runtime vm cache sync
* feat: configure runtime vm cache sync
* feat: prefetch vm cache on startup
* feat: await vm cache before vm startup
* fix: recheck vm cache after prefetch wait
* fix: address vm cache review feedback
* build(server): require VM cache manifest env
Introduce a new VM runtime layer using Lima for running containerised
workloads on macOS. Lifecycle covers decompress/create/start/stop with
stubs for upgrade/reset plus version-mismatch warnings.
- Foundation modules: paths, errors, manifest, telemetry
- lima.yaml generator + typed limactl wrapper with structured debug logging
- ssh ControlMaster transport for fast in-VM commands
- Ubuntu 24.04 minimal template, containerd default, 30GiB overlay disk
- browseros-dir helpers (getLimaHomeDir, getVmStateDir, getVmDisksDir);
OpenClaw dir moves into VM state dir
- Test helpers (fake-limactl, fake-ssh, test-env), vm-smoke integration
coverage, NODE_ENV propagation for spawned server test groups
