Adapters are baked at load time: they attach to the dense transformer,
then quantize_ converts only the frozen base linears (the lora_ side
path is excluded by name), then the loader compiles. Post-quant PEFT
injection is not possible on a manually quantized module, so the
prequant shortcut is skipped for a baked load and the memory plan is
sized for the dense build (force_dense on the quant candidate).
At generation time the baked topology is frozen: weight tweaks and
disabling (scale 0 reproduces the quantized base exactly) go through
set_adapters, while adding or removing adapters returns a clean 400
telling the client to reload with the new selection.
supports_lora now returns True for int8/fp8 diffusers loads (checked
before the gguf-kind early return, since the quant fast path keeps the
picker kind); nvfp4/mxfp8 and GGUF-via-diffusers stay blocked. The
load request model takes an optional loras list, threaded through
begin_load on both engines (native ignores it and keeps applying LoRA
at generation).
Verified end to end on GPU: Z-Image GGUF picker + int8 + trained
adapter loads through the API, bake marker logged, weight 1.0 vs 0
renders differ visibly, weight 0.5 accepted live, unknown adapter
rejected as 400. Affected suites: 304 passed.
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