Enable -race flag in mage Test target

The Test target now runs `go test -race -v ./...` so the race detector
catches data races during the normal test workflow. The full suite
(1017 tests) passes cleanly under the race detector.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/Magefile.go b/Magefile.go
index 71fdc1f..b1393be 100644
--- a/Magefile.go
+++ b/Magefile.go
@@ -255,12 +255,12 @@ func atomicInstallBinary(src, dstDir string) error {
 	return nil
 }
 
-// Test runs the test suite.
+// Test runs the test suite with the race detector enabled to catch data races.
 func Test() error {
 	if err := sh.RunV("go", "clean", "-testcache"); err != nil {
 		return err
 	}
-	return sh.RunV("go", "test", "-v", "./...")
+	return sh.RunV("go", "test", "-race", "-v", "./...")
 }
 
 // Coverage generates a combined coverage profile across all packages (cross-package coverage).