mi: read elements without per-call allocations (#2652)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>

internal/mi/errors.go

@@ -20,6 +20,7 @@ package mi
 import "errors"
 
 var (
-	ErrNotInitialized    = errors.New("not initialized")
-	ErrInvalidEntityType = errors.New("invalid entity type")
+	ErrNotInitialized     = errors.New("not initialized")
+	ErrInvalidEntityType  = errors.New("invalid entity type")
+	ErrInvalidElementName = errors.New("invalid element name")
 )