About 11 years ago, Jesse Olsen Bay found pieces of white and blue typewriter paper covered in hand-written notes and patchworks of poetry and prose written by his grandmother, the award-winning American author and activist Tillie Olsen, while he was helping her move to Oakland. She called them her “blueys.” Tillie, who is known for her depictions of women and the working class, was a perfectionist in her published work, Mr. Bay said. Her prose…