fix: clear bot owner on handoff

app/models/conversation.rb

@@ -165,6 +165,7 @@ class Conversation < ApplicationRecord
 
   def bot_handoff!
     update(waiting_since: Time.current) if waiting_since.blank?
+    self.assignee_agent_bot = nil
     open!
     dispatcher_dispatch(CONVERSATION_BOT_HANDOFF)
   end

spec/models/conversation_spec.rb

@@ -347,6 +347,14 @@ RSpec.describe Conversation do
       expect(conversation.reload.status).to eq('open')
     end
 
+    it 'clears agent bot ownership' do
+      conversation.update!(assignee_agent_bot: create(:agent_bot, account: conversation.account))
+
+      conversation.bot_handoff!
+
+      expect(conversation.reload.assignee_agent_bot).to be_nil
+    end
+
     it 'dispatches CONVERSATION_BOT_HANDOFF event' do
       expect(Rails.configuration.dispatcher).to receive(:dispatch)
         .with(described_class::CONVERSATION_BOT_HANDOFF, anything, hash_including(conversation: conversation))