fix bg_download URL (missing /resolve/main/)

pod setup script

sweep v2: pipelined, GPU never idles

pod-side full sweep orchestrator

pod benchmark: throughput + GPU-util sweep, reasoning on/off

fix: port probe logic, fail-fast on server death, symlink-safe cache

pod bootstrap: plug-and-play serving

fat llama.cpp bundle: sm_80+sm_120, CUDA 12.8, self-contained

initial commit