Add per-subreddit R4R conversation modes

tests/dashboard/settings.test.tsx

@@ -229,6 +229,40 @@ describe('settings and access', () => {
     expect(updateRequests).toBe(1);
   });
 
+  it('configures autonomous r4r per subreddit and requires explicit confirmation', async () => {
+    installConfigApi();
+    let requestBody: { subreddits: Array<{ conversation: { mode: string; maxAutomatedTurns: number } }> } | undefined;
+    server.use(http.put('/api/config', async ({ request }) => {
+      requestBody = await request.json() as typeof requestBody;
+      return HttpResponse.json({
+        success: true,
+        config: { rateLimit: config.rateLimit, browser: config.browser, reddit: config.reddit },
+        subreddits: requestBody?.subreddits ?? config.subreddits,
+      });
+    }));
+    const user = userEvent.setup();
+    renderSettings('/settings?section=behaviour');
+
+    const behaviour = await screen.findByRole('combobox', { name: 'Subreddit 1 conversation behaviour' });
+    expect(behaviour).toHaveValue('legacy');
+    expect(screen.queryByRole('spinbutton', { name: 'Subreddit 1 maximum automated turns' })).not.toBeInTheDocument();
+
+    await user.selectOptions(behaviour, 'r4r');
+    const maxTurns = screen.getByRole('spinbutton', { name: 'Subreddit 1 maximum automated turns' });
+    await user.clear(maxTurns);
+    await user.type(maxTurns, '7');
+    await user.click(screen.getByRole('button', { name: 'Save settings' }));
+
+    const dialog = screen.getByRole('dialog', { name: 'Confirm risky settings' });
+    expect(dialog).toHaveTextContent('Autonomous R4R will send conversational replies without approval');
+    expect(requestBody).toBeUndefined();
+    await user.click(within(dialog).getByRole('button', { name: 'Apply risky settings' }));
+
+    await waitFor(() => expect(requestBody?.subreddits[0].conversation).toEqual({
+      mode: 'r4r', maxAutomatedTurns: 7,
+    }));
+  });
+
   it('validates advanced application JSON before saving', async () => {
     installConfigApi();
     let updateRequests = 0;