CLAUDE: GPU_CHUNK env-tunable + GPU_CHUNK=4/expandable_segments for 16GB local

infer_server decode batched GPU_CHUNK scenes (p=[chunk,121,H,W]); 16 -> ~2.5GB -> OOM on the 16GB 5060 Ti
(shared with Eyesis JCuda). Make GPU_CHUNK env-tunable (default 16 for big GPUs); run_infer_local.sh sets
GPU_CHUNK=4 (+ expandable_segments) so local L1+L2 fits. By Claude 06/27/2026.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>