docs: README workaround for upstream missing __init__.py

Add a `touch embodiedscan/__init__.py` step before `pip install -e` so
fresh-env users don't hit `ModuleNotFoundError: embodiedscan` from the
upstream packaging bug. Tracked upstream as InternRobotics/EmbodiedScan#117;
this README line can be dropped once that's merged.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Monalissaa

data_preprocessing/embodiedscan/README.md

@@ -11,6 +11,11 @@ Supports 4 datasets: **ScanNet**, **3RScan**, **Matterport3D**, **ARKitScenes**.
 # The [visual] extras pull in open3d, which embodiedscan.explorer imports at module load.
 git clone https://github.com/OpenRobotLab/EmbodiedScan.git
 cd EmbodiedScan
+# Workaround for upstream packaging bug: top-level `embodiedscan/` lacks an
+# __init__.py so modern setuptools' find_packages() registers nothing on
+# `pip install -e`. Tracked in InternRobotics/EmbodiedScan#117 — drop this
+# line once it's merged.
+touch embodiedscan/__init__.py
 pip install -e ".[visual]"
 cd ..