updating and refactoring codebase for improved performance and maintainability

cmdlet/download_file.py

@@ -24,7 +24,8 @@ from SYS.pipeline_progress import PipelineProgress
 from SYS.result_table import Table
 from SYS.rich_display import stderr_console as get_stderr_console
 from SYS import pipeline as pipeline_context
-from SYS.metadata import normalize_urls as normalize_url_list
+# SYS.metadata import deferred: normalize_urls loaded lazily at call site to avoid
+# pulling in Cryptodome (~900ms) at module import time.
 from SYS.selection_builder import (
     extract_selection_fields,
     extract_urls_from_selection_args,
@@ -1226,6 +1227,7 @@ class Download_File(Cmdlet):
                     and not a.startswith("-")
                 )
             ]
+            from SYS.metadata import normalize_urls as normalize_url_list  # lazy: avoids Cryptodome at startup
             raw_url = normalize_url_list(url_candidates)
 
             quiet_mode = bool(config.get("_quiet_background_output")) if isinstance(config, dict) else False