Modernize build process

[Nikratio]

No description provided.

[Copilot]

Pull request overview

This pull request modernizes pyfuse3's build process by transitioning from the legacy setup.py approach to a modern pyproject.toml-based build system with uv for dependency management.

Key changes:

• Migrated from setup.py to pyproject.toml with PEP 517 build backend
• Introduced custom build backend (util/build_backend.py) for dynamic Cython extension configuration
• Added uv.lock for reproducible dependency resolution
• Updated CI/CD workflows to use uv instead of manual pip installations

Reviewed changes

Copilot reviewed 17 out of 18 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
pyproject.toml	Defines project metadata, dependencies, and build configuration using modern Python packaging standards
util/build_backend.py	Custom build backend that wraps setuptools and dynamically configures Cython extensions based on platform
uv.lock	Lock file for dependency versions (contains future dates that need investigation)
src/pyfuse3/_pyfuse3.py	Updated version management to use importlib.metadata instead of compile-time constants
src/pyfuse3/init.pyx	Removed hard-coded version, now imports from _pyfuse3 module
setup.py	Removed legacy setup.py file
setup.cfg	Removed legacy configuration file
src/_pyfuse3.py	Removed compatibility redirect module
src/pyfuse3_asyncio.py	Removed compatibility redirect module
rst/install.rst	Updated installation instructions to reflect modern build process
rst/asyncio.rst	Minor documentation cleanup
.github/workflows/test.yml	Updated CI workflow to use uv and modern Python tooling
developer-notes/setup.md	Added new developer setup instructions
developer-notes/release_process.rst	Updated release process documentation
developer-notes/valgrind.md	Added valgrind testing instructions
MANIFEST.in	Updated to exclude additional files from distributions
Changes.rst	Documented removal of pyfuse3_asyncio module
requirements.d/rtd.txt	Removed (Cython requirement now in pyproject.toml)

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