SEATTLE — Marcia Jackson sat at a wooden table between long shelves of books at the King County Law Library. The 64-year-old cook needed help dealing with what she described as a complex family trust issue.She had come to one of the few places where she could get it: a neighborhood law clinic, where volunteer lawyers dish out advice on a wide range of legal topics, for free.“When you’re talking about protecting yourself and knowing your rights, that shouldn’t be just for rich people,” she said.The state Supreme Court had …