api_huggingface 0.5.1

# tests/docs

GWT spec scenarios for all `api_huggingface` doc entity instances. Each subdirectory mirrors a `docs/` entity; each spec file mirrors one doc instance.

## Responsibility Table

| Path | Purpose |
|------|---------|
| `api/` | AP- scenarios mirroring `docs/api/` instances |
| `invariant/` | IN- scenarios mirroring `docs/invariant/` instances |
| `operation/` | OP- scenarios mirroring `docs/operation/` instances |
| `pattern/` | PT- scenarios mirroring `docs/pattern/` instances |
| `feature/` | FE-/FT- scenarios mirroring `docs/feature/` instances |
| `catalog/` | CL- scenarios mirroring `docs/catalog/` instances |
| `pitfall/` | PF- scenarios mirroring `docs/pitfall/` instances |