Add engagement-only conversation mode

tests/dashboard/settings-model.test.ts

@@ -324,6 +324,14 @@ describe('validateSubredditDraft', () => {
     expect(config?.conversation).toEqual({ mode: 'legacy', maxAutomatedTurns: 3, rapportTurnsBeforeMediaAsk: 3 });
   });
 
+  it('accepts engagement mode without an automated turn budget', () => {
+    const { config } = validateSubredditDraft(
+      draft({ conversationMode: 'engagement', maxAutomatedTurns: '', rapportTurnsBeforeMediaAsk: '' }),
+      [],
+    );
+    expect(config?.conversation).toEqual({ mode: 'engagement', maxAutomatedTurns: 3, rapportTurnsBeforeMediaAsk: 3 });
+  });
+
   it('requires rapport turns below the total budget for the hybrid mode', () => {
     const { errors } = validateSubredditDraft(
       draft({ conversationMode: 'r4r-media', maxAutomatedTurns: '4', rapportTurnsBeforeMediaAsk: '4' }),

tests/dashboard/subreddits.test.tsx

@@ -500,6 +500,20 @@ describe('subreddits page', () => {
       expect(saved[0][1].conversation.mode).toBe('manual');
     });
 
+    it('applies engagement-only policy without autonomous confirmation', async () => {
+      renderSubreddits();
+      const bar = await select('r4r');
+
+      await userEvent.setup().selectOptions(
+        within(bar).getByRole('combobox', { name: 'Set conversation policy for the selected subreddits' }),
+        'Engagement only',
+      );
+
+      await waitFor(() => expect(saved).toHaveLength(1));
+      expect(screen.queryByText('Confirm risky settings')).not.toBeInTheDocument();
+      expect(saved[0][1].conversation.mode).toBe('engagement');
+    });
+
     it('keeps the hybrid mode valid when bulk-applied to a short turn budget', async () => {
       // r/casualconversation defaults to 3 total / 3 rapport, which the hybrid
       // mode rejects. A bulk change has no form to fix it, so it must normalise.