Runs on push to main and pull requests against main: - go mod download + verify - make lint (go vet) - make build - make test (race detector) Uses actions/setup-go@v5 with built-in module caching, Go 1.22. Workflow times out at 5 minutes per the acceptance criteria. Closes #5. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>