chore: add ruff and clang-format via pre-commit

[jaywyawhare]

Adds two linting/formatting tools wired through pre-commit:

• ruff — Python linter and formatter (replaces flake8 + black + isort). Config lives in python/pyproject.toml. _ffi.py and _core.py have targeted ignores to avoid noise from generated/large files.
• clang-format — C/C++ formatter. Style config in .clang-format (LLVM base, 4-space indent, 100-col limit).

Usage

pip install pre-commit
pre-commit install        # installs git hooks
pre-commit run --all-files  # run manually

[greptile-apps]

Greptile Summary

This PR introduces pre-commit hooks for ruff (Python linting/formatting) and clang-format (C/C++ formatting), along with their respective configuration files. The setup follows standard conventions: ruff lint with --fix runs before ruff-format, versions are pinned, and per-file ignores for _ffi.py and _core.py are well-reasoned given their FFI/C-interop nature.

Confidence Score: 5/5

Safe to merge — purely additive tooling configuration with no logic changes.

All three files are new or additive config; no P0/P1 issues found. Hook order, pinned versions, line-length consistency (100 cols in both ruff and clang-format), and per-file ignores are all correct.

No files require special attention.

Important Files Changed

Filename	Overview
.pre-commit-config.yaml	New pre-commit config wiring ruff (v0.11.8) and clang-format (v19.1.7); correct hook order (ruff lint+fix before ruff-format), versions pinned.
.clang-format	New clang-format config based on LLVM with 4-space indent, 100-col limit, and SortIncludes disabled to preserve order-dependent C includes.
python/pyproject.toml	Adds ruff lint/format config; per-file ignores for _ffi.py and _core.py are intentional; E501 globally ignored (standard pattern when ruff-format enforces line length).

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