Assignment notifications should always be delivered

- They're effectively @mentions
- This means watching really reflects the UI state: Watching for new cards

app/models/notifier/card_event_notifier.rb

@@ -6,7 +6,7 @@ class Notifier::CardEventNotifier < Notifier
     def recipients
       case source.action
       when "card_assigned"
-        source.assignees.excluding(creator, *source.collection.access_only_users)
+        source.assignees.excluding(creator)
       when "card_published"
         watchers_and_subscribers(include_only_watching: true).without(creator, *card.mentionees)
       when "comment_created"

test/models/notifier/event_notifier_test.rb

@@ -87,4 +87,12 @@ class Notifier::EventNotifierTest < ActiveSupport::TestCase
       Notifier.for(events(:layout_commented)).notify
     end
   end
+
+  test "assignment events notify assignees regardless of involvement level" do
+    collections(:writebook).access_for(users(:jz)).access_only!
+
+    notifications = Notifier.for(events(:logo_assignment_jz)).notify
+
+    assert_equal [ users(:jz) ], notifications.map(&:user)
+  end
 end