Added support for OpenAI-compatible structured output

internal/validate/standard_validator_test.go

@@ -158,3 +158,52 @@ func TestStandardValidatorJSONSchemaSchemaLoadError(t *testing.T) {
 		t.Fatal("expected schema load error")
 	}
 }
+
+func TestStandardValidatorLoadSchemaDocumentSuccess(t *testing.T) {
+	tmp := t.TempDir()
+	if err := os.WriteFile(filepath.Join(tmp, "schema.json"), []byte(`{
+  "type": "object",
+  "properties": {
+    "name": {"type": "string"}
+  }
+}`), 0644); err != nil {
+		t.Fatal(err)
+	}
+
+	v := NewStandardValidator(tmp)
+	loader, ok := v.(SchemaDocumentLoader)
+	if !ok {
+		t.Fatal("standard validator must implement SchemaDocumentLoader")
+	}
+
+	doc, err := loader.LoadSchemaDocument(context.Background(), "schema.json")
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	obj, ok := doc.(map[string]any)
+	if !ok {
+		t.Fatalf("expected object document, got %#v", doc)
+	}
+	if obj["type"] != "object" {
+		t.Fatalf("expected schema type=object, got %#v", obj["type"])
+	}
+}
+
+func TestStandardValidatorLoadSchemaDocumentInvalidJSON(t *testing.T) {
+	tmp := t.TempDir()
+	if err := os.WriteFile(filepath.Join(tmp, "schema.json"), []byte(`{`), 0644); err != nil {
+		t.Fatal(err)
+	}
+
+	v := NewStandardValidator(tmp)
+	loader, ok := v.(SchemaDocumentLoader)
+	if !ok {
+		t.Fatal("standard validator must implement SchemaDocumentLoader")
+	}
+
+	_, err := loader.LoadSchemaDocument(context.Background(), "schema.json")
+	if err == nil {
+		t.Fatal("expected decode error")
+	}
+}