Fix dendrogram names

Separates legacy behavior (YAML files) and modern behavior (TOML files).
When using TOML files, the output name is updated to reflect the subset
of platforms that were actually included in the analysis.

Signed-off-by: John Pennycook <[email protected]>

bin/codebasin

@@ -306,11 +306,17 @@ def main():
 
     # Print clustering report
     if report_enabled("clustering"):
-        if config_file is None:
-            platform_names = [p[0] for p in args.platforms]
-            output_prefix = "-".join(platform_names)
-        else:
+        # Legacy behavior: guess prefix from YAML filename
+        if config_file is not None:
             output_prefix = os.path.realpath(guess_project_name(config_file))
+
+        # Modern behavior: append platforms to TOML filename
+        else:
+            basename = os.path.basename(args.analysis_file)
+            filename = os.path.splitext(basename)[0]
+            platform_names = [p for p in codebase["platforms"]]
+            output_prefix = "-".join([filename] + platform_names)
+
         clustering_output_name = output_prefix + "-dendrogram.png"
         clustering = report.clustering(clustering_output_name, setmap)
         if clustering is not None: