Add engagement-only conversation mode

tests/conversation-automation.test.ts

@@ -11,7 +11,7 @@ function harness(
   sellerDomains: string[] = [],
   openerSentAt: number | null = 0,
   subredditConversation?: {
-    mode: 'legacy' | 'r4r' | 'r4r-media' | 'manual';
+    mode: 'legacy' | 'engagement' | 'r4r' | 'r4r-media' | 'manual';
     maxAutomatedTurns: number;
     rapportTurnsBeforeMediaAsk?: number;
   },
@@ -739,14 +739,14 @@ describe('conversation automation', () => {
     expect(ai.generateMediaAsk).not.toHaveBeenCalled();
     expect(chat.sendChatMessage).toHaveBeenCalledTimes(2);
     expect(getSaved()?.automation).toMatchObject({
-      policyMode: 'r4r', policyVersion: 4, maxAutomatedTurns: 2, turnsUsed: 2,
+      policyMode: 'r4r', policyVersion: 5, maxAutomatedTurns: 2, turnsUsed: 2,
     });
     expect(getSaved()?.askedForMedia).toBe(false);
   });
 
   it('snapshots the r4r policy so later configuration changes do not switch an active conversation', async () => {
     const behaviour: {
-      mode: 'legacy' | 'r4r' | 'r4r-media' | 'manual';
+      mode: 'legacy' | 'engagement' | 'r4r' | 'r4r-media' | 'manual';
       maxAutomatedTurns: number;
     } = {
       mode: 'r4r', maxAutomatedTurns: 2,
@@ -774,6 +774,29 @@ describe('conversation automation', () => {
     expect(await service.processConversation(incoming(1))).toBeNull();
   });
 
+  it('completes engagement mode on the first reply without generating, sending, or handing off', async () => {
+    const { service, ai, chat, claims, triage, getSaved } = harness(
+      [], [], 0, { mode: 'engagement', maxAutomatedTurns: 3 },
+    );
+
+    const result = await service.processConversation(incoming(1));
+
+    expect(result).toMatchObject({ kind: 'engaged', remainingTurns: 0 });
+    expect(getSaved()?.automation).toMatchObject({
+      policyMode: 'engagement',
+      status: 'engaged',
+      turnsUsed: 0,
+      lastIncomingKey: 'in-1',
+      handoffReason: 'The recipient replied; the engagement goal is complete.',
+    });
+    expect(claims.markSuperseded).toHaveBeenCalledWith('room-alice', 'in-1');
+    expect(triage.setStatus).toHaveBeenCalledWith('room-alice', 'done', null, 1_000);
+    expect(ai.generateReply).not.toHaveBeenCalled();
+    expect(ai.generateMediaAsk).not.toHaveBeenCalled();
+    expect(chat.sendChatMessage).not.toHaveBeenCalled();
+    expect(await service.processConversation(incoming(1))).toBeNull();
+  });
+
   it('hands r4r conversations to a human when age or contact safety gates trigger', async () => {
     const underage = harness([], [], 0, { mode: 'r4r', maxAutomatedTurns: 5 });
     const result = await underage.service.processConversation(incoming(1, "I'm 17, what about you?"));
@@ -844,7 +867,7 @@ describe('conversation automation', () => {
     expect(fixture.getSaved()?.askedForMedia).toBe(true);
     expect(fixture.getSaved()?.automation).toMatchObject({
       policyMode: 'r4r-media',
-      policyVersion: 4,
+      policyVersion: 5,
       rapportTurnsBeforeMediaAsk: 2,
       hybridPhase: 'post-media-ask',
       turnsUsed: 4,