feat(cli): report core in dry-run, build plots from exported CSV

beta_spectrum/cli.py

@@ -40,7 +40,6 @@ def _build_parser() -> argparse.ArgumentParser:
             "  bs_pnpi --nuclide Tc99 --output spectrum.csv\n"
             "  bs_pnpi --input custom_input.json --output spectrum.csv\n"
             "  bs_pnpi --nuclide Tc99 --plot spectrum.png --output spectrum.csv\n"
-            "  bs_pnpi --nuclide Tc99 --detector gaussian --output convolved.csv\n"
             "  bs_pnpi --nuclide Tc99 --output spectrum.csv -vv --log-file /tmp/calc.log\n"
             "  bs_pnpi --nuclide Tc99 --dry-run\n"
         ),
@@ -326,9 +325,20 @@ def _run(args: argparse.Namespace) -> None:
         )
         logger.info("Spectrum exported to %s", args.output)
 
-    # Generate plot
+    # Generate plot — always built from the exported CSV data (single
+    # source of truth): when a full-verbosity CSV was exported it is
+    # plotted directly from that file, otherwise via a temporary export.
     if args.plot:
         analyzer = BetaSpectrumAnalyzer(spectrum, config, logger=logger)
+        if args.output and args.csv_verbosity == "full":
+            from beta_spectrum.output.visualization import Visualizer
+
+            Visualizer.plot_from_csv(
+                args.output,
+                save_path=args.plot,
+                show_components=(args.verbose >= 2),
+            )
+        else:
             analyzer.plot_analysis(
                 save_path=args.plot,
                 show_components=(args.verbose >= 2),
@@ -342,11 +352,8 @@ def _print_dry_run_output(config, source_type: str) -> None:
     """Print resolved configuration for dry-run mode."""
     from beta_spectrum.logging_utils import get_git_short_hash
 
+    print("Core:       phase_space × fermi (basic spectrum, always included)")
     enabled = []
-    if config.use_phase_space:
-        enabled.append("phase_space")
-    if config.use_fermi:
-        enabled.append("fermi")
     if config.use_screening:
         enabled.append("screening")
     if config.use_finite_size: