Verify ConfigKit integration and record release handoff

internal/adapter/cli/run_test.go

@@ -1148,6 +1148,64 @@ backends:
 	}
 }
 
+func TestConfiguredBackendPreservesIntegerParameterAndOptionalCredential(t *testing.T) {
+	lib := newCLITestLibrary(t)
+	writePromptDefinition(t, lib.promptDir, "custom.yaml", `id: custom
+version: "1"
+default_profile: local-gpu
+messages:
+  - role: user
+    content: "hello"
+output:
+  format: text
+  validation_mode: none
+`)
+	if err := os.WriteFile(filepath.Join(lib.profileDir, "local-gpu.yaml"), []byte("id: local-gpu\nbackend: local-gpu\nmodel: local-model\n"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	const credentialName = "SCRIPTORIUM_OPTIONAL_BACKEND_KEY"
+	t.Setenv(credentialName, "")
+	type observedRequest struct {
+		number        json.Number
+		authorization string
+	}
+	observed := make(chan observedRequest, 1)
+	provider := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		request := observedRequest{authorization: r.Header.Get("Authorization")}
+		var body map[string]any
+		decoder := json.NewDecoder(r.Body)
+		decoder.UseNumber()
+		if err := decoder.Decode(&body); err == nil {
+			request.number, _ = body["synthetic_count"].(json.Number)
+		}
+		observed <- request
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write([]byte(`{"choices":[{"message":{"role":"assistant","content":"generated"}}]}`))
+	}))
+	defer provider.Close()
+	configPath := writeAppConfigFile(t, fmt.Sprintf(`prompt_dir: %q
+profile_dir: %q
+backends:
+  local-gpu:
+    endpoint: %q
+    api_key_env: %s
+    extra_params:
+      synthetic_count: 7
+`, lib.promptDir, lib.profileDir, provider.URL+"/v1", credentialName))
+	cfg, err := parseRunArgs([]string{"--config", configPath, "--prompt", "custom"})
+	if err != nil || len(cfg.backends) != 1 || cfg.backends[0].ExtraParams["synthetic_count"] != int64(7) {
+		t.Fatalf("ConfigKit integer did not reach runtime settings: cfg=%+v err=%v", cfg, err)
+	}
+	code, stdout, stderr := runCLICommand(t, runCommand, []string{"--config", configPath, "--prompt", "custom"})
+	if code != ExitOK {
+		t.Fatalf("backend run failed: code=%d out=%q err=%q", code, stdout, stderr)
+	}
+	request := <-observed
+	if !strings.Contains(stdout, "generated") || request.number != "7" || request.authorization != "" {
+		t.Fatalf("backend request changed: code=%d out=%q err=%q count=%q auth=%q", code, stdout, stderr, request.number, request.authorization)
+	}
+}
+
 func TestRenderCommandMapsReasoningEffortAndSessionID(t *testing.T) {
 	lib := newCLITestLibrary(t)
 	writePromptDefinition(t, lib.promptDir, "session.yaml", `id: session