feat(core): improve in-memory validation, FatturaPA detection coverage, and published type compatibility

ts_install/download-xrechnung-rules.ts

@@ -1,4 +1,5 @@
 #!/usr/bin/env tsx
+/// <reference types="node" />
 /**
  * Downloads official XRechnung Schematron validation rules
  * from the KoSIT repositories
@@ -179,4 +180,4 @@ if (import.meta.url === `file://${process.argv[1]}`) {
   });
 }
 
-export default downloadXRechnungRules;
+export default downloadXRechnungRules;