Add camera-split checkpoints: lift_head (head stereo -> lift 1D) + arm_wrist (left wrist -> arm/gripper 16D), 38ep/25407f, 3000 steps

Add pi05_can_left_v3_lora 2999 (server-trained, batch16/3000steps, final loss median 0.0324)

Add pi05_can1_lora checkpoint 2999 (openpi pi0.5 LoRA finetuned on can1, loss~0.033, RTX4090)