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As a warm-up to making natlab support multiple operating systems, start with an easy one (in that it's also Unixy and open source like Linux) and add FreeBSD 15.0 as a VM OS option for the vmtest integration test framework, and add TestSubnetRouterFreeBSD which tests subnet routing through a FreeBSD VM (Gokrazy → FreeBSD → Gokrazy). Key changes: - Add FreeBSD150 OSImage using the official FreeBSD 15.0 BASIC-CLOUDINIT cloud image (xz-compressed qcow2) - Add GOOS()/IsFreeBSD() methods to OSImage for cross-compilation and OS-specific behavior - Handle xz-compressed image downloads in ensureImage - Refactor compileBinaries into compileBinariesForOS to support multiple GOOS targets (linux, freebsd), with binaries registered at <goos>/<name> paths on the file server VIP - Add FreeBSD-specific cloud-init (nuageinit) user-data generation: string-form runcmd (nuageinit doesn't support YAML arrays), fetch(1) instead of curl, FreeBSD sysctl names for IP forwarding, mkdir /usr/local/bin, PATH setup for tta - Skip network-config in cidata ISO for FreeBSD (DHCP via rc.conf) Updates tailscale/tailscale#13038 Change-Id: Ibeb4f7d02659d5cd8e3a7c3a66ee7b1a92a0110d Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>