Tack documentation examples

All tutorial adaptations and new teaching material are Copyright (c) 2026
Kitware, Inc. Files marked BSD-3-Clause use Tack's repository LICENSE.

dye.py, physarum.py, contours.py and mpm.py adapt examples from Taichi,
Copyright (c) The Taichi Authors, licensed under Apache License 2.0.
The original mpm88 example is by Yuanming Hu. The Physarum example credits
Sage Jenson's model and visual work. Each file and its tutorial link to
the original source and describe the changes made for teaching.

nbody.py adapts NVIDIA Warp's tile N-body example, Copyright (c) 2022
NVIDIA CORPORATION & AFFILIATES, licensed under Apache License 2.0.
The tiled algorithm is described by Lars Nyland, Mark Harris and Jan Prins
in GPU Gems 3, chapter 31, Fast N-Body Simulation with CUDA.

Apache-2.0 files retain that license; its text accompanies the examples in
LICENSE-APACHE-2.0.txt. They are not relicensed under Tack's BSD license.