/todos: a kanban board over the todo/ tree, owner-only

The filesystem is the database: GET reads the tree through the same module the
index generator now imports, PATCH splices frontmatter (status, priority, due,
order) and never touches a body byte, and every write regenerates TODO.md.
Columns open/doing/blocked/done, native drag between them, selection and theme
filter in the URL. Registry entry 'todos' (kind admin, 22 entries, docs:check
green), isSuperAdmin double-gate on the router.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

todo/tooling/a-kanban-board-over-todo-synchronised-both.md

@@ -1,8 +1,8 @@
 ---
 id: tooling/a-kanban-board-over-todo-synchronised-both
-title: "A Kanban board over `todo/`, synchronised both ways"
+title: 'A Kanban board over `todo/`, synchronised both ways'
 theme: tooling
-status: open
+status: done
 created: 2026-08-21
 date_source: stated
 order: 1
@@ -26,3 +26,24 @@ Open, and deliberately not decided here: which columns (`status` today holds onl
 `doing` and `blocked` are new values whenever the board wants them); whether it is an Officer screen, a
 panel app or a plugin; and how it notices a change made on disk while the board is open — a watcher, a
 poll, or a refresh button, which is the cheapest thing that works.
+
+---
+
+**Built 2026-08-24 — `/todos`, a core screen, deliberately not a plugin.** The tree lives in the
+platform's own repo, and dev tooling about the platform's backlog has nothing to gain from being
+installable elsewhere.
+
+What v1 is: `GET /api/todos` reads the tree (shared module `api/todos/todo-tree.ts`, which
+`scripts/todo-index.ts` now also imports, so the board and the generated index cannot disagree);
+`PATCH /api/todos/item` splices frontmatter — status, priority, due, order — and never touches a body
+byte, with tests asserting exactly that. Columns are open / doing / blocked / done; drag a card to move
+it, and every write regenerates `TODO.md`. Selection and theme filter are `?selected=` / `?theme=`, so
+cards are real links and a filtered board is an addressable page. Owner-only: `todos` is `kind: 'admin'`
+in the registry (now 22 entries, docs:check green) with an `isSuperAdmin` gate on the router as the
+second lock.
+
+Answers to this item's open questions: the columns are those four statuses, new values are one edit to
+`TODO_STATUSES`; it is a screen, not a plugin; change detection is a 30s refetch — the cheapest thing
+that works, as predicted. Not done: creating or editing items from the board (the body is the owner's
+half, written in an editor), and drag does not reorder within a column — `order` is PATCHable but no
+gesture drives it yet.