xctrl server: bread convention is 20D state in / 14D actions out (tofu template was 14D state)

Add xctrl-style flat-obs policy server (Tianming template)

README: deployment section

Add deployment scripts (server launcher + NUC client contract)

R1 ckpt-10000: pi0.5 LoRA RA-BC, 200 curated bimanual UMI episodes

initial commit