escala 1: Meteor 1.6.1.1 -> 1.8.3

meteor update --release 1.8.3 + Babel beta->stable fix.

- Core packages bumped (meteor 1.9.3, ecmascript 0.13.2, mongo 1.7.0,
  npm-mongo 3.2.0 driver — still compatible with Mongo 3.2 server).
- Fix boot failure 'Cannot find @babel/runtime/helpers/objectSpread2':
  upgraded @babel/runtime 7.0.0-beta.44 -> ^7.29.7 (stable 7.x; not 8.x).
- underscore auto-added, fetch/modern-browsers added by the release.

REST smoke test byte-identical to baseline. See UPGRADE.md.

package.json

@@ -6,7 +6,7 @@
     "test": "jest"
   },
   "dependencies": {
-    "@babel/runtime": "^7.0.0-beta.44",
+    "@babel/runtime": "^7.29.7",
     "@cleverbeagle/dates": "^0.5.1",
     "@cleverbeagle/seeder": "^1.3.1",
     "@turf/buffer": "^5.1.5",