Description

A CI workflow that builds and tests the project on every push and pull request provides a safety net for regressions and gives contributors confidence that their changes work.

Acceptance Criteria

• Runs on every push and pull request to master/main
• Builds with zig build (ReleaseSafe)
• Runs all tests with zig build test
• At least one integration test: pipe CSV via stdin and assert SQL output
• Matrix build covers: ubuntu-latest, macos-latest, windows-latest
• Build status badge added to README

Notes

• Use mlugg/setup-zig@v1 to install Zig in CI
• Cache ~/.cache/zig to speed up subsequent builds