T13c Files: FileTree with git status and filter, DirectoryListing, SelectableList activation (review pending: codex 401)

tasks/ch11-20.md

@@ -111,10 +111,10 @@
 
 ## T13c Lists & Trees · Files
 
-- [ ] FileTree
-- [ ] DirectoryListing
-- [ ] Menu List → `menus::Menu`
-- [ ] Transfer List → `forms::TransferList`
+- [x] FileTree → `lists::FileTree`, `GitStatus`; built on `lists::Tree`
+- [x] DirectoryListing → `lists::DirectoryListing`, `DirEntry`; rows through `lists::SelectableList`
+- [x] Menu List → `menus::Menu`
+- [x] Transfer List → `forms::TransferList`
 
 ## T14 Tables — `src/tables`