Add Windows guest networking

[sjmiller609]

summary

• attach Windows guests to Hypeman TAP networks
• configure IPv4, default routes, and DNS through native Windows APIs
• apply fresh allocations on create and start without a shell fallback
• document the Windows network readiness model in the instance README
• consolidate guest-control and networking coverage into one Windows lifecycle scenario

targeted tests

• Windows create and hypervisor-config unit tests
• Windows guest-agent cross-compilation
• dedicated Windows lifecycle integration gate

The dedicated Windows lifecycle KVM gate and full Linux, Darwin, and install suites pass.

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Note

Medium Risk
Changes guest networking on create/start and new Windows IP/route/DNS logic in the guest agent; failures tear down VMs, but misconfiguration could break Windows instance connectivity.

Overview
Windows instances can now use NetworkEnabled and the same TAP allocation model as Linux, with IPv4, default route, and DNS applied through the guest agent instead of being rejected at create time.

The ReconfigureNetwork RPC gains dns_servers, and the Windows guest agent implements full reconfiguration via native APIs (adapter lookup by MAC, unicast addresses, routes, and SetInterfaceDnsSettings). Linux keeps the existing shell-command fallback only when the RPC is unimplemented; Windows does not.

Create and start treat guest network setup as readiness: after the VM is up, the manager calls reconfigureGuestNetworkConfig for Windows; failure stops the instance and fails the operation. Start reapplies allocation when a stopped instance may have a new IP or MAC.

CI links Windows fixtures into /ci/windows, renames the integration gate to Windows lifecycle (TestWindowsLifecycleIntegration), and extends it with networking checks (allocated IP/DNS, RDP on 3389, ICMP). Docs describe the Windows networking model and RDP as reachability through the allocated IP, not a Hypeman API.

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