[no-ci] docs: add uv and pixi installation instructions (#1650)

* docs: add uv and pixi installation instructions

Add installation instructions for two modern Python package managers:

- uv: A fast Python package and project manager from Astral, compatible
  with PyPI packages. Instructions cover basic install, optional deps,
  and virtual environment creation.

- pixi: A cross-platform package manager built on the conda ecosystem,
  with support for conda-forge packages. Instructions cover project
  initialization, adding dependencies via CLI, and pixi.toml config.

Both tools are increasingly popular in the scientific Python community
and provide faster dependency resolution than traditional pip/conda.

Closes #1248

* docs: refocus uv/pixi sections on development workflows

* docs: revert cuda_bindings install.rst to upstream

Remove changes to cuda_bindings/ as requested by maintainer —
external contributors cannot modify files under that path.
The uv/pixi dev workflow docs remain in cuda_core/.

Signed-off-by: Maxime Grenu <maxime.grenu@gmail.com>

---------

Signed-off-by: Maxime Grenu <maxime.grenu@gmail.com>

Author: cluster2600

cuda_core/docs/source/install.rst

@@ -71,6 +71,56 @@ and likewise use ``cuda-version=13`` for CUDA 13.
 Note that to use ``cuda.core`` with nvJitLink installed from conda-forge requires ``cuda.bindings`` 12.8.0+.
 
 
+Development environment
+-----------------------
+
+The sections above cover end-user installation. The section below focuses on
+a repeatable *development* workflow (editable installs and running tests).
+
+Development with uv
+~~~~~~~~~~~~~~~~~~~
+
+`uv`_ is a fast Python package and project manager. For example, to work on
+``cuda-core`` against CUDA 13:
+
+.. code-block:: console
+
+   $ git clone https://github.com/NVIDIA/cuda-python
+   $ cd cuda-python/cuda_core
+   $ uv venv
+   $ source .venv/bin/activate   # On Windows: .venv\Scripts\activate
+   $ uv pip install -e .[cu13] --group test
+
+Run tests:
+
+.. code-block:: console
+
+   $ python -m pytest tests
+
+.. _uv: https://docs.astral.sh/uv/
+
+Development with pixi
+~~~~~~~~~~~~~~~~~~~~~
+
+`pixi`_ provides a reproducible development environment across the repository.
+From the repository root:
+
+.. code-block:: console
+
+   $ git clone https://github.com/NVIDIA/cuda-python
+   $ cd cuda-python
+   $ pixi run -e cu13 test-core
+
+To run all repository tests (pathfinder → bindings → core):
+
+.. code-block:: console
+
+   $ pixi run -e cu13 test
+
+Use ``-e cu12`` to test against CUDA 12 instead.
+
+.. _pixi: https://pixi.sh/
+
 Installing from Source
 ----------------------