finetune: add GGUF publish prep workflow

finetune: add GGUF eval harness with chatml prompt

finetune: add merge and GGUF conversion tooling

finetune: add Hugging Face publish tooling

finetune: add Actor SFT v1 audit and eval hardening

finetune: add Actor SFT v1 hardening path

finetune: add Actor LoRA eval pipeline

finetune: add Modal actor LoRA training pipeline

finetune: add optional actor SFT seed ingestion

finetune: add actor SFT v0 dataset pipeline