refactor(tool-todo): store the trimmed content, matching the dedupe key

toTodoList dedupes and length-checks on the trimmed content but stored the raw
item.content, so a todo with leading/trailing whitespace was deduped by its
trimmed form yet persisted untrimmed — the stored value and the uniqueness key
could differ. Store the trimmed content so the persisted list matches what was
validated.

packages/todo/tool-todo/src/index.ts

@@ -70,7 +70,7 @@ function toTodoList(raw: { content: string; status: string }[]): TodoItem[] {
       throw new Error(`invalid todo status ${JSON.stringify(status)}: expected one of ${STATUSES.join(', ')}`)
     }
     if (status === 'in_progress') inProgress++
-    todos.push({ content: item.content, status })
+    todos.push({ content, status })
   }
   if (inProgress > 1) {
     throw new Error(`invalid todos: at most one task may be in_progress, got ${inProgress}`)