chore: add .githooks pre-commit lint check

[iamvirul]

Pull Request

Type of Change

• 🔧 Chore (build process, CI/CD, dependency updates)
• 📖 Documentation update

Description

Adds a .githooks/pre-commit script that runs ruff against staged Python files before every commit. This gives contributors immediate lint feedback locally rather than waiting for CI.

The hook is opt-in — contributors activate it once per clone with:

git config core.hooksPath .githooks

Related Issues / PRs

Closes #32

Changes Made

• .githooks/pre-commit — pre-commit script that lints staged .py files with ruff; uses uv run ruff if uv is available, falls back to plain ruff
• CONTRIBUTING.md — added hook setup instructions; corrected clone URL to VecGrep/VecGrep; added --extra dev to uv sync

Testing

• Manual testing — staged a file with a lint violation, confirmed commit was blocked with the correct message
• Staged a clean file, confirmed commit was allowed through

Checklist

• My code follows the project's style guidelines (ruff passes)
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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