T13b Trees: Tree, TreeNode, TreeSelect, Outline, Disclosure (review pending: codex 401)

tasks/ch11-20.md

@@ -103,11 +103,11 @@
 
 ## T13b Lists & Trees · Trees
 
-- [ ] Tree / TreeView — also T06b TreeSelect
-- [ ] VirtualTree → `lists::Tree`
-- [ ] CheckboxTree
-- [ ] Outline
-- [ ] NestedList → `lists::Outline`
+- [x] Tree / TreeView → `lists::Tree`, `TreeNode`; also T06b TreeSelect → `lists::TreeSelect`
+- [x] VirtualTree → `lists::Tree`, whose rows draw in a `uniform_list`
+- [x] CheckboxTree → `lists::Tree` with `checked`
+- [x] Outline → `lists::Outline`
+- [x] NestedList → `lists::Outline`
 
 ## T13c Lists & Trees · Files