Add Virtualization Framework Support

Nucleic-Session: 4FCF4F8B-A7C3-42F6-BE13-1979080F61C7
Co-authored-by: Nucleic <[email protected]>

Package.swift

@@ -155,6 +155,11 @@ let package = Package(
                 .product(name: "Containerization", package: "containerization"),
                 .product(name: "ContainerizationOCI", package: "containerization"),
             ]),
+        // Standalone de-risking spike for the macOS-VM rework: drives the real `MacVMEngine`
+        // end-to-end on Apple's `Virtualization` framework — clone the golden base, boot the guest,
+        // `ssh` a command in, and stream stdout (the `mac_vm_exec` agent path); `NUCLEIC_MACVM_BUILD_BASE=1`
+        // runs the one-time macOS install instead. Run signed with signing/spike.entitlements; not shipped.
+        .executableTarget(name: "macvm-spike", dependencies: ["NucleicCore"]),
         .testTarget(
             name: "NucleicProtocolTests",
             dependencies: ["NucleicProtocol"]