fix up dependencies

src/kiri-mode/sla/driver.js

@@ -3,10 +3,6 @@
 "use strict";
 
 // use: kiri.print
-// use: kiri.client
-// use: kiri-mode.sla.client
-// use: kiri-mode.sla.slice
-// use: kiri-mode.sla.export
 gapp.register("kiri-mode.sla.driver", [], (root, exports) => {
 
 const { kiri } = root

src/kiri-mode/sla/slice.js

@@ -8,6 +8,7 @@
 // dep: geo.polygons
 // dep: kiri.slice
 // dep: kiri-mode.sla.driver
+// use: ext.pngjs
 gapp.register("kiri-mode.sla.slice", [], (root, exports) => {
 
 const { base, kiri } = root;