Tomales suffered a one-two punch with the closure of K&A Takeaway, which sold its last gourmet sandwich last winter, and the William Tell House, which shuttered after the pandemic. Now, locals and visitors have some culinary news to celebrate. Shannon Gregory, who owns Route One Bakery and Kitchen and the Marshall Store, has opened an outpost of his bayside oyster joint in the tiny space previously occupied by K&A. It serves a limited version of…