Enable race tests in mage automation (p3)

- Test runs unit tests then race detector via mg.Deps
- Add TestRace target for race-only runs
- Document mage test vs testRace in AGENTS.md

Made-with: Cursor

1 files changed, 2 insertions, 1 deletions

diff --git a/AGENTS.md b/AGENTS.md
index 9fc309d..6558be1 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -13,7 +13,8 @@ go build -o goprecords ./cmd/goprecords
 
 # Run tests
 go test ./...
-# or: mage test
+# Full check (unit + race): mage test
+# Race only: mage testRace
 
 # Run integration tests
 ./goprecords test