fix: testcontainers dolt setup — add mysql driver, downgrade image, fix stale API refs

- Import go-sql-driver/mysql in doltserver.go so testcontainers can initialize
- Use Dolt 1.43.0 Docker image (1.82.4 has broken auth handshake for root
  connections via go-sql-driver)
- Use default test/test credentials instead of root
- Update rig_park_persistence_test.go to use new container API names

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: steveyegge

internal/cmd/rig_park_persistence_test.go

@@ -38,18 +38,18 @@ func randomTestPrefix(t *testing.T) string {
 func setupRigBeadsDB(t *testing.T, rigPath, prefix string) *beads.Beads {
 	t.Helper()
 	requireBdCLI(t)
-	testutil.RequireDoltServer(t)
+	testutil.RequireDoltContainer(t)
 
-	port, _ := strconv.Atoi(testutil.DoltTestPort())
+	port, _ := strconv.Atoi(testutil.DoltContainerPort())
 	b := beads.NewIsolatedWithPort(rigPath, port)
 	if err := b.Init(prefix); err != nil {
 		t.Fatalf("bd init failed: %v", err)
 	}
 
-	// Keep the shared test Dolt server clean.
+	// Keep the test container clean.
 	dbName := "beads_" + prefix
 	t.Cleanup(func() {
-		dsn := "root:@tcp(127.0.0.1:" + testutil.DoltTestPort() + ")/"
+		dsn := "root:@tcp(127.0.0.1:" + testutil.DoltContainerPort() + ")/"
 		db, err := sql.Open("mysql", dsn)
 		if err != nil {
 			t.Logf("cleanup: sql.Open failed for %s: %v", dbName, err)

internal/testutil/doltserver.go

@@ -10,13 +10,15 @@ import (
 	"sync"
 	"testing"
 
+	_ "github.com/go-sql-driver/mysql" // required by testcontainers Dolt module
 	"github.com/testcontainers/testcontainers-go"
 	"github.com/testcontainers/testcontainers-go/modules/dolt"
 )
 
 // DoltDockerImage is the Docker image used for Dolt test containers.
-// Matches MinDoltVersion in internal/deps/dolt.go.
-const DoltDockerImage = "dolthub/dolt-sql-server:1.82.4"
+// Note: 1.82.4 has a broken auth handshake for root connections via
+// the MySQL wire protocol with go-sql-driver. Use 1.43.0 which works.
+const DoltDockerImage = "dolthub/dolt-sql-server:1.43.0"
 
 var (
 	doltCtr      *dolt.DoltContainer
@@ -41,7 +43,7 @@ func isDockerAvailable() bool {
 func startSharedDoltContainer() {
 	ctx := context.Background()
 	ctr, err := dolt.Run(ctx, DoltDockerImage,
-		dolt.WithUsername("root"),
+		dolt.WithDatabase("gt_test"),
 	)
 	if err != nil {
 		doltCtrErr = fmt.Errorf("starting Dolt container: %w", err)
@@ -72,7 +74,7 @@ func StartIsolatedDoltContainer(t *testing.T) string {
 
 	ctx := context.Background()
 	ctr, err := dolt.Run(ctx, DoltDockerImage,
-		dolt.WithUsername("root"),
+		dolt.WithDatabase("gt_test"),
 	)
 	if err != nil {
 		t.Fatalf("starting Dolt container: %v", err)