feat: mixed-model PR Review Squad (Opus + Sonnet + Codex)

.gitignore

@@ -48,3 +48,4 @@ screenshot_*.png
 *.screenshot.png
 *.bmp
 *.tiff
+app.db

PolyPilot.Tests/SessionOrganizationTests.cs

@@ -2090,6 +2090,29 @@ public void BuiltInPresets_IncludePRReviewSquad()
         Assert.NotNull(prSquad.RoutingContext);
         Assert.NotNull(prSquad.WorkerSystemPrompts);
         Assert.Equal(prSquad.WorkerModels.Length, prSquad.WorkerSystemPrompts!.Length);
+
+        // All 5 workers must be Opus (they dispatch sub-agents internally)
+        foreach (var model in prSquad.WorkerModels)
+            Assert.Equal("claude-opus-4.6", model);
+
+        // Worker prompts must instruct multi-model sub-agent dispatch and adversarial consensus
+        foreach (var prompt in prSquad.WorkerSystemPrompts)
+        {
+            Assert.Contains("claude-opus-4.6", prompt);
+            Assert.Contains("claude-sonnet-4.6", prompt);
+            Assert.Contains("gpt-5.3-codex", prompt);
+            Assert.Contains("task", prompt); // dispatch via task tool
+            Assert.Contains("Adversarial Consensus", prompt);
+            Assert.Contains("NEVER post more than one comment", prompt);
+        }
+
+        // Fix process must use merge, not rebase
+        Assert.Contains("git merge", prSquad.SharedContext!);
+        Assert.DoesNotContain("git rebase", prSquad.SharedContext);
+        Assert.DoesNotContain("force-with-lease", prSquad.SharedContext);
+
+        // Routing must enforce 1 worker per PR
+        Assert.Contains("ONE worker per PR", prSquad.RoutingContext!);
     }
 
     [Fact]
@@ -2531,7 +2554,7 @@ public void Scenario_CreateGroupFromPreset()
 
         // Step 4: System creates the group - verify the preset structure
         // (CopilotService.CreateGroupFromPresetAsync does the actual creation at runtime)
-        Assert.Equal("claude-sonnet-4.6", prReview.WorkerModels[0]);
+        Assert.Equal("claude-opus-4.6", prReview.WorkerModels[0]);
 
         // Step 5-6: Each member has appropriate capabilities
         var orchCaps = ModelCapabilities.GetCapabilities(prReview.OrchestratorModel);

PolyPilot/Components/Pages/Dashboard.razor

@@ -2219,11 +2219,11 @@
             return;
         }
 
-        var started = await CopilotService.StartFleetAsync(sessionName, arg);
+        var (started, error) = await CopilotService.StartFleetAsync(sessionName, arg);
         if (started)
             session.History.Add(ChatMessage.SystemMessage($"🚀 Fleet started for: *{arg}*"));
         else
-            session.History.Add(ChatMessage.ErrorMessage("Failed to start fleet mode. Ensure the session is connected and idle."));
+            session.History.Add(ChatMessage.ErrorMessage($"Failed to start fleet mode: {error ?? "Unknown error"}"));
     }
 
     private async Task HandlePromptCommand(string sessionName, AgentSessionInfo session, string arg)