internal/pkg: consolidate cache attributes

This makes the interface stable.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/mbf/main.go

@@ -203,11 +203,11 @@ func main() {
 		"v", command.BoolFlag(false),
 		"Do not suppress verbose output from init",
 	).Flag(
-		&cm.cures,
+		&cm.attr.Cures,
 		"cures", command.IntFlag(0),
 		"Maximum number of dependencies to cure at any given time",
 	).Flag(
-		&cm.jobs,
+		&cm.attr.Jobs,
 		"jobs", command.IntFlag(0),
 		"Preferred number of jobs to run, when applicable",
 	).Flag(
@@ -934,8 +934,8 @@ func main() {
 				return fmt.Errorf("unknown artifact %q", args[1])
 			}
 
-			if !a.IsExclusive() && cm.jobs < 1 {
-				cm.jobs = runtime.NumCPU()/n + 1
+			if !a.IsExclusive() && cm.attr.Jobs < 1 {
+				cm.attr.Jobs = runtime.NumCPU()/n + 1
 			}
 
 			res := make([]unique.Handle[pkg.Checksum], n)