Simplify codebase per audit of 4e20fe8

internal/codex/gen/main.go

@@ -81,7 +81,6 @@ type bundle struct {
 
 type gen struct {
 	defs    map[string]*schema
-	order   []string
 	emitted map[string]bool
 	kinds   map[string]string
 	out     bytes.Buffer