add logicjs with great hope that this simplifies 2d sketch constraints

package.json

@@ -36,6 +36,7 @@
         "earcut": "^2.2.3",
         "express-useragent": "^1.0.13",
         "jszip": "^3.7.1",
+        "logicjs": "^1.0.0",
         "manifold-3d": "^2.5.1",
         "moment": "^2.29.4",
         "serve-static": "^1.14.1",

src/main/mesh.js

@@ -15,6 +15,7 @@
 // dep: mesh.build
 // dep: load.file
 // use: geo.polygons
+// use: ext.logic
 gapp.main("main.mesh", [], (root) => {
 
 const { Quaternion } = THREE;