Add engagement-only conversation mode

tests/conversation-triage.test.ts

@@ -82,6 +82,7 @@ describe('conversation triage', () => {
     it('does not call an actively automated or never-automated conversation manual', () => {
       expect(isManualFlow(chat({ username: 'a', automationStatus: 'active' }))).toBe(false);
       expect(isManualFlow(chat({ username: 'b' }))).toBe(false);
+      expect(isManualFlow(chat({ username: 'c', automationStatus: 'engaged', automationPolicyMode: 'engagement' }))).toBe(false);
     });
 
     it('explains why a conversation is being handled by hand', () => {
@@ -94,6 +95,7 @@ describe('conversation triage', () => {
       expect(manualFlowLabel(chat({ username: 'd', automationStatus: 'killed' })))
         .toBeNull();
       expect(manualFlowLabel(chat({ username: 'e', automationStatus: 'active' }))).toBeNull();
+      expect(manualFlowLabel(chat({ username: 'f', automationStatus: 'engaged' }))).toBeNull();
     });
   });