feat: add token file and env Login

auth/tokens_test.go

@@ -0,0 +1,24 @@
+package auth_test
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"s1d3sw1ped/robinhood-agentic-mcp/auth"
+)
+
+func TestWriteTokensMode(t *testing.T) {
+	t.Parallel()
+	path := filepath.Join(t.TempDir(), "tokens.json")
+	if err := auth.WriteTokens(path, "abc", ""); err != nil {
+		t.Fatal(err)
+	}
+	st, err := os.Stat(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if st.Mode().Perm() != 0o600 {
+		t.Fatalf("perm %o", st.Mode().Perm())
+	}
+}