fix: resolve retired/preview gemini model routing and test configuration errors

internal/router/heuristic_test.go

@@ -140,3 +140,65 @@ func TestRouteHeuristic_LegacyRules(t *testing.T) {
 		t.Fatalf("expected kimi-k2.6, got %s", dec2.SelectedModel)
 	}
 }
+
+func TestRouteHeuristic_SoftwareDevelopmentCondition(t *testing.T) {
+	targets := []string{
+		"gemini-3-flash",
+		"kimi-k2.7-code",
+		"deepseek-v4-pro",
+		"mimo-v2.5-pro",
+	}
+
+	rulesJSON := `[
+		{
+			"rule_id": "agentic_code_and_tools",
+			"conditions": {
+				"requires_tool_calling": true,
+				"is_software_development": true
+			},
+			"primary_model": "kimi-k2.7-code",
+			"fallback_model": "deepseek-v4-pro"
+		},
+		{
+			"rule_id": "agentic_general_tasks",
+			"conditions": {
+				"requires_tool_calling": true
+			},
+			"primary_model": "mimo-v2.5-pro"
+		}
+	]`
+
+	group := db.ModelGroup{
+		ID:             "dustins_stack",
+		Strategy:       "heuristic",
+		HeuristicRules: &rulesJSON,
+	}
+
+	// 1. Tool calling + Software dev should route to kimi-k2.7-code
+	ctx1 := &RouteContext{
+		UserMessage:           "Write a python script to parse logs",
+		RequiresToolCalling:   true,
+		IsSoftwareDevelopment: true,
+	}
+	dec1, err := routeHeuristic(group, targets, ctx1)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if dec1.SelectedModel != "kimi-k2.7-code" {
+		t.Fatalf("expected kimi-k2.7-code, got %s", dec1.SelectedModel)
+	}
+
+	// 2. Tool calling but NOT Software dev should route to mimo-v2.5-pro
+	ctx2 := &RouteContext{
+		UserMessage:           "Search the web for weather in New York",
+		RequiresToolCalling:   true,
+		IsSoftwareDevelopment: false,
+	}
+	dec2, err := routeHeuristic(group, targets, ctx2)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if dec2.SelectedModel != "mimo-v2.5-pro" {
+		t.Fatalf("expected mimo-v2.5-pro, got %s (reason: %s)", dec2.SelectedModel, dec2.Reason)
+	}
+}