• Fixed: Session was not closed on exception in Importer.execute().
• Fixed resource leaks: streams and writers are now properly closed via try-with-resources
  in ExtractionModel, RestrictionModel, CommandLineParser, ModelBuilder,
  IntraDatabaseEntityGraph and SQLConsole.
• Fixed: InterruptedException in shutdown hook now restores the interrupt flag and exits the wait loop.
• Fixed: LOB insert methods (insertClob, insertSQLXML) refactored to eliminate duplicate code;
  resource leak in stream handling corrected.