feat(adapter): registry with detect filtering and duplicate guard

internal/render/json.go

@@ -0,0 +1,18 @@
+// Package render holds deterministic format marshallers.
+package render
+
+import (
+	"bytes"
+	"encoding/json"
+)
+
+func JSON(v any) ([]byte, error) {
+	var buf bytes.Buffer
+	enc := json.NewEncoder(&buf)
+	enc.SetIndent("", "  ")
+	enc.SetEscapeHTML(false)
+	if err := enc.Encode(v); err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
+}