P1 #1 + #2: ``LoadRequest._no_embedded_hf_tokens`` and
``ValidateModelRequest._no_embedded_hf_tokens`` now cover
``gguf_variant`` in addition to ``model_path``. A caller could
pass a variant like ``Q4_K_M-hf_xxxxxxxx`` that flowed into
structured log sinks via the GGUF resolver path; the matching
``DiffusionLoadRequest`` validator already covered every string
field, so this restores parity.
P1 #3: ``/api/inference/unload`` now also matches the llama
``loading_model_identifier`` when picking the GGUF branch. A
pending GGUF download (``is_active`` still False,
``loading_model_identifier`` populated) used to fall through to
the safetensors branch and respond ``status="unloaded"`` while
llama-server kept downloading.
P1 #4 + #5: the final safetensors-handoff sweeps (route-level
``_release_safetensors_chat_for`` and backend
``_release_chat_backend_for_diffusion``) now check ``active_model_name``
and ``loading_models`` WITHOUT the initial ``owned_names`` filter.
A concurrent ``/load`` that landed AFTER the snapshot was
previously ignored, so a chat model that began loading during the
unload window let training / export / GGUF chat / diffusion start
anyway and race the new chat for VRAM.
P2 #6: added ``_preflight_diffusers_subfolder_config`` and
invoked it for GGUF loads with a transformer class
(``effective_base``, ``"transformer"``). A custom base companion
that had ``model_index.json`` but lacked
``transformer/config.json`` previously passed the round 19
preflight, unloaded chat, then failed inside
``from_single_file``.
P2 #7: ``_scrub_validation_obj`` in main.py also scrubs string
dict KEYS. Pydantic ``string_type`` errors surface ``input``
verbatim, and a malformed payload like
``{"repo_id": {"hf_xxxxx": "owner/repo"}}`` would otherwise leak
the token through the 422 response body.
All 85 diffusion-relevant + 35 model-validation tests pass
locally. Existing fakes for ``hf_hub_download`` updated to
accept the new ``subfolder=`` kwarg the round 21 preflight uses.
(P1 #3 cross-workload GPU handoff lock from round 20 is still
deferred; round 21's P1 #4 / #5 raised the sweep-level guarantee,
which closes the most common race without the deadlock risk of
holding a process-wide lock across the entire load.)
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