Add image/vision/AI foundation and camera geometry (Epics 83-88)

[rsasaki0109]

Summary

• Land Epics 83–87: spatialrust-image-io, CPU imgproc, spatialrust-tensor + DLPack, spatialrust-ai ONNX Runtime, and Feature2D/ORB with Python bindings.
• Complete Epic 88: camera geometry contracts, H/F/E RANSAC, PnP, sparse Lucas–Kanade, stereo BM/rectify, Python/OpenCV/Criterion closure.
• Add canonical docs/ROADMAP.md for Epics 83–90 and reserve long-term Epics 91–100.

Test plan

• cargo test -p spatialrust-vision --features geometry --lib
• cargo test -p spatialrust-vision --features full --test properties
• cargo test -p spatialrust-tensor --features dlpack
• cargo test -p spatialrust-image-io
• Spot-check OpenCV comparison for geometry cases in bench/opencv_vision_comparison