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Add NIC attachment hot-swap support to Host.app: VZNetworkDevice.attachment is writable at runtime, so --disconnected-nic creates a NIC with no attachment, and --attach-network hot-swaps it to a vnet dgram socket after boot/restore. macOS detects link-up and does DHCP. Refactor TailMacConfigHelper: extract createDgramAttachment() and createDisconnectedNetworkDeviceConfiguration() from the monolithic createSocketNetworkDeviceConfiguration(). Add --screenshot-port flag for headless mode. Host.app serves GET /screenshot as JPEG via a localhost HTTP server, capturing the VZVirtualMachineView via CGWindowListCreateImage. The Go test harness polls these to push live thumbnails to the web dashboard. Also: SIGINT handler in headless mode for clean VM state save. Updates #13038 Change-Id: I42fba0ecd760371b4ec5b26a0557e3dd0ba9ecae Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>