add SAM3/LangSAM install guide to README.md, extend model flag to run_pipeline.sh and new notebook for VLM-MASK-REASONER#18

tharencandi wants to merge 3 commits into

Netflix:mainNetflix/void-model:mainfrom

tharencandi:feat/stage3-segmentation-model-flagtharencandi/void-model:feat/stage3-segmentation-model-flagCopy head branch name to clipboard