The GGUF load-source probe added in #467 reads
model_config.quantization, but the AWQ lifecycle stubs predate that
field.
Set quantization=None so the dtype-alignment tests reach the AWQ
checkpoints again.

Tests: pytest tests/quant/ -m slow -v --tb=short
(5 passed, 39 deselected)

Fixes #507

Signed-off-by: PinJhih <isaacwang29@gmail.com>