CLI, ACP, and the desktop app all got nested-subtask rendering (the
optional `parent` field on a todo item), but the TUI never did. Its
TodoItem type had no `parent` field, parseTodos() in turnController.ts
dropped it even if the tool payload sent it, and TodoPanel rendered the
list with a flat map() and a single fixed indent — a session using
nested subtasks showed every subtask at the same visual level as its
parent, with no hierarchy cue, in the terminal UI.
- types.ts: add the optional `parent` field to TodoItem, matching
apps/desktop/src/lib/todos.ts's TodoItem exactly.
- turnController.ts: parseTodos() now preserves parent (trimmed,
dropped if empty or self-referential), the same normalization
desktop's parseArray() applies.
- lib/todo.ts: port todoTree() from apps/desktop/src/lib/todos.ts
verbatim — same DFS-with-depth algorithm, same dangling/cycle
handling, so both surfaces render identical hierarchy from the same
`parent` field.
- todoPanel.tsx: render todoTree(todos) instead of a flat map(), with
per-row indentation scaled by depth (capped at 4 levels, mirroring
desktop's status-row.tsx cap).
nftpoetrist
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