refactor: compose deployment with pluggable spec resolver, basic test

internal/compose/project.go

@@ -1,5 +1,7 @@
 package compose
 
+// TODO: make compose, cli, and api packages public.
+
 import (
 	"context"
 	"fmt"

internal/compose/service.go

@@ -7,9 +7,6 @@ import (
 )
 
 func ServiceSpecFromCompose(name string, service types.ServiceConfig) (api.ServiceSpec, error) {
-	// TODO: resolve the image to a digest and supported platforms using an image resolver that broadcasts requests
-	//  to all machines in the cluster.
-	// TODO: configure placement filter based on the supported platforms of the image.
 	spec := api.ServiceSpec{
 		Container: api.ContainerSpec{
 			Command: service.Command,