feat: complete contract-driven business development and MySQL integration

errors/export.go

@@ -0,0 +1,23 @@
+package apierrors
+
+import (
+	"encoding/json"
+	"errors"
+	"io"
+)
+
+// ExportCatalog writes normalized, public-only error metadata. Invoke this
+// explicitly from project tooling, using the same Catalog function registered
+// at runtime. The API CLI reads the artifact; it never executes project code.
+func ExportCatalog(w io.Writer, c Catalog) error {
+	if w == nil {
+		return errors.New("errors: catalog export writer required")
+	}
+	registry, err := NewRegistry(c)
+	if err != nil {
+		return err
+	}
+	encoder := json.NewEncoder(w)
+	encoder.SetIndent("", "  ")
+	return encoder.Encode(registry.Catalog())
+}