fix: preserve closed status on bot assignment

app/services/conversations/assignment_service.rb

@@ -27,7 +27,7 @@ class Conversations::AssignmentService
 
     conversation.assignee = nil
     conversation.assignee_agent_bot = agent_bot
-    conversation.status = :pending
+    conversation.status = :pending if conversation.open?
     conversation.save!
     agent_bot
   end

spec/services/conversations/assignment_service_spec.rb

@@ -65,6 +65,14 @@ describe Conversations::AssignmentService do
         expect(conversation.assignee_id).to be_nil
         expect(conversation.status).to eq('pending')
       end
+
+      it 'preserves status when assigning an agent bot to a closed conversation' do
+        conversation.update!(assignee: agent, assignee_agent_bot: nil, status: :resolved)
+
+        service.perform
+
+        expect(conversation.reload.status).to eq('resolved')
+      end
     end
   end
 end