cc-sandbox: add ssh

flake.nix

@@ -90,7 +90,22 @@
 				mem = 8192;
 				extraModules = [({ pkgs, ... }: {
 					nixpkgs.config.allowUnfree = true;
-					nix.settings.experimental-features = [ "nix-command" "flakes" ];
+					nix = {
+						registry.nix-mcp = {
+							from = {
+								type = "github";
+								owner = "illustris";
+								repo = "nix-mcp";
+							};
+							to = nix-mcp;
+						};
+						settings.experimental-features = [ "nix-command" "flakes" ];
+					};
+
+					services.openssh.enable = true;
+					users.users.root.openssh.authorizedKeys.keys = [
+						"ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAm3qVkTmuYEayM3Vstruv8w5SM4K9riokAxUcpothhO illustris@illustris-thinkpad"
+					];
 
 					environment.systemPackages = with pkgs; [
 						claude-code-bin
@@ -103,6 +118,9 @@
 
 					microvm = {
 						writableStoreOverlay = "/nix/.rw-store";
+						forwardPorts = [
+							{ from = "host"; host.port = 2222; guest.port = 22; }
+						];
 						shares = [
 							{
 								proto = "9p";