move vendored mocha, et al to package.json

Author: mockdeep

.rubocop_todo.yml

@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config --auto-gen-only-exclude --exclude-limit 400`
-# on 2026-02-14 01:48:12 UTC using RuboCop version 1.84.2.
+# on 2026-02-14 02:53:21 UTC using RuboCop version 1.84.1.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
@@ -252,7 +252,7 @@ Rails/Validation:
   Exclude:
     - 'app/models/story.rb'
 
-# Offense count: 20
+# Offense count: 21
 # This cop supports unsafe autocorrection (--autocorrect-all).
 # Configuration parameters: EnforcedStyle.
 # SupportedStyles: brackets, fetch
@@ -267,6 +267,7 @@ Style/HashLookupMethod:
     - 'app/controllers/stories_controller.rb'
     - 'config/application.rb'
     - 'exe/stylelint_autogen'
+    - 'spec/javascript/test_controller.rb'
     - 'spec/repositories/feed_repository_spec.rb'
     - 'spec/repositories/story_repository_spec.rb'
     - 'spec/repositories/user_repository_spec.rb'

package.json

@@ -6,8 +6,14 @@
   },
   "devDependencies": {
     "@eslint/js": "^9.21.0",
+    "chai": "1.6.0",
+    "chai-backbone": "0.9.4",
+    "chai-changes": "1.3.6",
     "eslint": "^9.21.0",
     "globals": "^16.0.0",
+    "mocha": "3.5.0",
+    "sinon": "1.7.1",
+    "sinon-chai": "2.14.0",
     "stylelint": "^17.3.0",
     "stylelint-config-recess-order": "^7.6.1",
     "stylelint-config-standard": "^40.0.0",