Disable auto-detection of extra columns for CLN wells

CLN wells are less likely to come from Groundwater Vistas exports
and often have trailing comments like "Node Q" that would be
incorrectly parsed as data columns.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: reneangermeyer

flopy/pakbase.py

@@ -1169,14 +1169,16 @@ def load(
                 current_cln = pak_type.get_empty(
                     itmp_cln, aux_names=aux_names, structured=False, **usg_args
                 )
+                # Disable auto-detection for CLN wells - they're less likely
+                # to come from Groundwater Vistas and often have trailing comments
                 current_cln = ulstrd(
                     f,
                     itmp_cln,
                     current_cln,
                     model,
                     sfac_columns,
                     ext_unit_dict,
-                    auto_detect_extra_cols=auto_detect_extra_cols,
+                    auto_detect_extra_cols=False,
                 )
                 current_cln["node"] -= 1
                 bnd_output_cln = np.recarray.copy(current_cln)