fix(spaces): three runtime fixes — input staging dir, walker, cache perms

fix(models): walker recurses into Power Lora Loader nested dict + spatial upscaler comfy_type

fix(models): subfolder= on Kijai VAE/text-encoder entries

fix(models): walk_workflow_for_models reads API format

fix(spaces): use \$HOME instead of /data (no persistent-storage add-on needed)

feat(spaces): registry entries for renamed BF16 aliases + seed inputs + bootstrap

fix(backend,models): runtime corrections from end-to-end testing

ci: run unit tests + ruff lint on every push

feat(models): ensure_models with HF cache symlinks + missing-file fallback

feat(models): walk_workflow_for_models scans loader nodes

feat(models): MODEL_REGISTRY mapping filenames to HF repos