add conservative quota availability filtering

internal/domain/domain.go

@@ -155,6 +155,17 @@ func ValidatePayload(typ string, p map[string]any) error {
 		if err := requiredString("subject_ref"); err != nil {
 			return err
 		}
+	case "QuotaReported":
+		if err := requiredString("harness_id"); err != nil {
+			return err
+		}
+		if v, ok := p["consumed"].(float64); !ok || v < 0 {
+			return fmt.Errorf("%w: consumed required", ErrInvalid)
+		}
+	case "StandupAdvisory":
+		if _, ok := p["items"]; !ok {
+			return fmt.Errorf("%w: items required", ErrInvalid)
+		}
 	}
 	return nil
 }