refactor: rename visualize module to output module and separate concerns into core, csv_export, and visualization modules

beta_spectrum/cli.py

@@ -155,7 +155,7 @@ def _build_parser() -> argparse.ArgumentParser:
     log_group.add_argument(
         "--csv-separator",
         type=str,
-        default=',',
+        default=",",
         help="CSV column separator (default: ','). Use 'tab' for tab separation.",
     )
     log_group.add_argument(
@@ -183,7 +183,7 @@ def _run(args: argparse.Namespace) -> None:
         BranchConfig,
         SpectrumConfig,
     )
-    from beta_spectrum.visualize import BetaSpectrumAnalyzer
+    from beta_spectrum.output import BetaSpectrumAnalyzer
 
     # Determine logging level
     if args.quiet: