refactor: remove automatic diffusers→checkpoints dual-linking

Removed automatic checkpoint linking logic that was incorrectly
duplicating diffusers models to checkpoints directory. Models should
only be linked to their explicitly configured directory type.

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

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

artifact_comfyui_download.sh

@@ -537,50 +537,6 @@ link_model() {
         done <<< "$model_files"
     fi
 
-    # Also link checkpoint files to checkpoints/ directory if they exist
-    # This handles models like SDXL that have both diffusers and checkpoint formats
-    local checkpoint_dir="${COMFYUI_DIR}/checkpoints"
-    if [[ "$model_type" == "diffusers" ]]; then
-        # Clean existing checkpoint symlinks for this repo
-        find "$checkpoint_dir" -type l -lname "*${repo_id/\//-}*" -delete 2>/dev/null || true
-
-        # Look for checkpoint .safetensors files in the snapshot root (not in subdirectories)
-        # These are the consolidated model files like sd_xl_base_1.0.safetensors
-        local checkpoint_files
-        checkpoint_files=$(echo "$model_files" | grep -E 'snapshots/[^/]+/[^/]+\.safetensors$' | grep -vE '/(vae|text_encoder|transformer|unet|tokenizer)/' || true)
-
-        if [[ -n "$checkpoint_files" ]]; then
-            mkdir -p "$checkpoint_dir"
-            while IFS= read -r ckpt_file; do
-                if [[ -f "$ckpt_file" ]] && [[ -n "$ckpt_file" ]]; then
-                    local ckpt_name=$(basename "$ckpt_file")
-
-                    # Skip if it's clearly a component file (has parent directory in name)
-                    if [[ "$ckpt_file" =~ /(vae|text_encoder|transformer|unet|tokenizer)/ ]]; then
-                        continue
-                    fi
-
-                    # Only link if the file is large enough to be a checkpoint (> 500MB)
-                    # Use -L to follow symlinks (HuggingFace cache uses symlinks to blobs)
-                    local file_size=$(stat -L -c%s "$ckpt_file" 2>/dev/null || echo "0")
-                    if [[ $file_size -gt 524288000 ]]; then
-                        local ckpt_link="${checkpoint_dir}/${ckpt_name}"
-
-                        # Remove existing symlink if it exists
-                        if [[ -L "$ckpt_link" ]]; then
-                            rm -f "$ckpt_link"
-                        fi
-
-                        # Create symlink to checkpoints directory
-                        ln -s "$ckpt_file" "$ckpt_link"
-                        print_detail "${LINK} Also linked to checkpoints: ${DIM}${ckpt_name}${RESET}"
-                        linked_count=$((linked_count+1))
-                    fi
-                fi
-            done <<< "$checkpoint_files"
-        fi
-    fi
-
     if [[ $linked_count -gt 0 ]]; then
         print_success "Linked ${linked_count} file(s) for ${BOLD_WHITE}${repo_id}${RESET}"
         return 0