fix(native): make MySQL connection check immediate on first attempt

The waitForMySQL function was timing out before making any connection
attempt when using short timeouts (500ms). The ticker waits 500ms before
the first tick, at which point a 500ms timeout would already be expired.

This fix adds an immediate connection attempt before entering the ticker
loop, ensuring that at least one connection attempt is made even with
short timeouts.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: claude

internal/sqltest/native/mysql.go

@@ -166,6 +166,11 @@ func waitForMySQL(ctx context.Context, uri string, timeout time.Duration) error
 	ticker := time.NewTicker(500 * time.Millisecond)
 	defer ticker.Stop()
 
+	// Make an immediate first attempt before waiting for the ticker
+	if err := tryMySQLConnection(ctx, uri); err == nil {
+		return nil
+	}
+
 	var lastErr error
 	for {
 		select {
@@ -175,23 +180,24 @@ func waitForMySQL(ctx context.Context, uri string, timeout time.Duration) error
 			if time.Now().After(deadline) {
 				return fmt.Errorf("timeout waiting for MySQL (last error: %v)", lastErr)
 			}
-			db, err := sql.Open("mysql", uri)
-			if err != nil {
-				lastErr = err
-				slog.Debug("native/mysql", "open-attempt", err)
-				continue
-			}
-			// Use a short timeout for ping to avoid hanging
-			pingCtx, cancel := context.WithTimeout(ctx, 2*time.Second)
-			err = db.PingContext(pingCtx)
-			cancel()
-			if err != nil {
+			if err := tryMySQLConnection(ctx, uri); err != nil {
 				lastErr = err
-				db.Close()
 				continue
 			}
-			db.Close()
 			return nil
 		}
 	}
 }
+
+func tryMySQLConnection(ctx context.Context, uri string) error {
+	db, err := sql.Open("mysql", uri)
+	if err != nil {
+		slog.Debug("native/mysql", "open-attempt", err)
+		return err
+	}
+	defer db.Close()
+	// Use a short timeout for ping to avoid hanging
+	pingCtx, cancel := context.WithTimeout(ctx, 2*time.Second)
+	defer cancel()
+	return db.PingContext(pingCtx)
+}