docs: correct the tools install path and Clip usage

README.md

@@ -86,17 +86,23 @@ Clips are 11 s to 8.5 min of continuous motion — no cuts, no teleports.
 
 ```bash
 git clone https://github.com/AlayaLab/WorldRover
-pip install -r WorldRover/requirements.txt
+pip install -r WorldRover/tools/requirements.txt   # numpy, opencv-python; ffmpeg/ffprobe on PATH
+cd WorldRover/tools                                # the package is not pip-installable yet
 ```
 
 ```python
 from worldrover import Clip
-clip = Clip("venice/fp/venice_000000")
-rgb, depth_m = clip.rgb_frame(100), clip.depth_frame(100)   # sRGB uint8; metres
-pts = clip.points_world(100)                                # world points, centimetres
+
+clip    = Clip("/data/WorldRover-6scenes/venice/fp/venice_000000")
+rgb     = clip.rgb_frame(100)     # uint8 (H, W, 3), sRGB
+depth_m = clip.depth_frame(100)   # planar depth in metres
+pts     = clip.points_world(100)  # world points, centimetres
+poses   = clip.poses              # per-frame pose + intrinsics
 ```
 
-The loader handles the three conventions above for you.
+`Clip` takes a filesystem path to a clip directory. The reader takes the depth pixel format
+from that clip's own `depth/depth.meta.json`, so it handles both encodings used across these
+repositories, and it converts radial depth and the off-by-one trajectory row for you.
 
 ## License