Fix variant filtering in consolidation script

The variant filter was using `_variant={variant}_` which failed to match
directory names like `author_variant=content_tokenizer=...` because there's
no underscore between the variant name and the next parameter.

Changed to `variant={variant}` to correctly match all variant models.

This fixes the issue where only 1 model (371 rows) was being consolidated
instead of all 80 models (360,640 rows) for content-only variant.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: jeremymanning

code/consolidate_model_results.py

@@ -45,7 +45,7 @@ def consolidate_model_results(models_dir='models', output_path=None, save_csv=Fa
 
     # Filter by variant
     if variant:
-        model_dirs = [d for d in all_model_dirs if f'_variant={variant}_' in d.name]
+        model_dirs = [d for d in all_model_dirs if f'variant={variant}' in d.name]
         variant_label = f"{variant} variant"
     else:
         model_dirs = [d for d in all_model_dirs if '_variant=' not in d.name]