Add Windows guest control and ConPTY

[sjmiller609]

summary

• cross-compile the guest agent as a Windows LocalSystem service
• listen on the virtio-win VioSock provider and retain port 2222 protocol compatibility
• add SYSTEM and active desktop execution sessions
• add ConPTY terminal allocation and resize handling
• support Windows file copy, stat, readiness, and graceful shutdown
• promote Windows instances to Running when guest-agent readiness is proven
• keep Linux guest-agent behavior and lifecycle tests unchanged

tests

• GOOS=windows GOARCH=amd64 CGO_ENABLED=0 go test -c ./lib/system/guest_agent
• go test ./lib/system/guest_agent ./lib/guest
• go test -run 'TestHydrateBootMarkersUsesWindowsGuestAgentAsBootMarker|TestValidateWindowsCreate|TestRejectWindowsSnapshotLifecycle' ./lib/instances
• CI=true HYPEMAN_WINDOWS_TEST_AGENT_PERSONA=/ci/windows/persona-agent.qcow2 go test -run TestWindowsGuestAgentIntegration -v -timeout 20m ./lib/instances on deft
• cumulative deft gate: TestWindowsConfigIntegration, TestWindowsImagesIntegration, TestWindowsGuestAgentIntegration, and Linux TestQEMUStandbyAndRestore

fixture

The private test persona contains the signed virtio-win VioSock driver and the current guest-agent service. No Windows media, generated disks, credentials, or licensing material is committed.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	github.com/​aymanbagabas/​go-pty@​v0.2.2

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