fix: extract filename from source_pattern before calling find_model_files()

The source_pattern can include subdirectories (e.g., "unet/model.safetensors"),
but find_model_files() filters by filename only. Now we:

1. Extract just the filename using basename
2. Find files matching that filename
3. Filter results to match the full source_pattern path

This allows proper matching of files in subdirectories.

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

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

artifact_huggingface_download.sh

@@ -619,9 +619,13 @@ link_model() {
                 continue
             fi
 
-            # Find the specific file using its source pattern as filter
+            # Extract just the filename from the source pattern (remove directory path)
+            local filename_only
+            filename_only=$(basename "$source_pattern")
+
+            # Find files matching the filename, then filter by full source pattern
             local source_file
-            source_file=$(find_model_files "$repo_id" "$source_pattern" 2>/dev/null | head -n1)
+            source_file=$(find_model_files "$repo_id" "$filename_only" 2>/dev/null | grep "/$source_pattern$" | head -n1)
 
             if [[ -z "$source_file" ]] || [[ ! -f "$source_file" ]]; then
                 print_warning "Source file not found: ${source_pattern}"