refactor(virt): gate colima service on Darwin; adapt vmType per arch; add docker-compose

- Wrap services.colima with lib.mkIf hostPlatform.isDarwin so the
  module is a no-op on NixOS/Linux guests
- Drop isActive (deprecated field) from the default profile
- Set vmType = "vz" on aarch64 (Apple Virtualization.framework) and
  fall back to "qemu" on x86_64 for compatibility
- Add docker-compose to the package list alongside docker/lazydocker

Author: DivitMittal

home/tools/virt.nix

@@ -2,30 +2,32 @@
   pkgs,
   lib,
   config,
+  hostPlatform,
   ...
 }: {
-  # Enable colima as a service with docker runtime
-  services.colima = {
+  # colima manages Lima VMs; macOS-only (launchd-backed)
+  # isService = false → no launchd agent; start manually with `colima start`
+  services.colima = lib.mkIf hostPlatform.isDarwin {
     enable = true;
     colimaHomeDir = "${config.xdg.configHome}/colima";
     coreutilsPackage = pkgs.uutils-coreutils;
     profiles.default = {
-      isActive = true;
       isService = false;
       settings = {
-        # Container runtime
         runtime = "docker";
 
         cpu = 6;
         memory = 6;
         disk = 10;
 
-        # Disable kubernetes
         kubernetes.enabled = false;
 
-        # VM settings
-        vmType = "vz"; # Apple Virtualization.framework (faster on Apple Silicon)
-        autoActivate = true;
+        # vz: Apple Virtualization.framework — native on Apple Silicon (macOS 12+),
+        # requires macOS 13 on Intel; fall back to qemu on x86 for compatibility.
+        vmType =
+          if hostPlatform.isAarch64
+          then "vz"
+          else "qemu";
       };
     };
   };
@@ -36,6 +38,7 @@
       ### container management
       ## docker
       docker
+      docker-compose
       lazydocker
       ## kubernetes
       kubectl