@@ -25,13 +25,18 @@ failure objectui#7664's own first cut shipped at `onCardClick`.
   including tests: 0 hits / 0 files each, with `groupBy` (85 hits / 27 files),
   `cardTitle` (18/9) and `coverImageField` (17/3) firing as controls on the same
   instrument. An author who wrote `allowCollapse: true` validated green and got
-  a board that never collapsed off that key. Each capability exists on a
-  *different* channel, and the refusal message names it: a lane's own
-  `columns[].collapsed` for collapsing, a `templates` component prop for card
-  templates, a `useColumnWidths` hook option for widths. Wiring a board-level
-  switch to any of them would be new behaviour and is not ordered here.
-  `CardTemplate` and `ColumnWidthConfig` stay exported — the prop and the hook
-  still consume the types.
+  a board that never collapsed off that key. At this change, each capability
+  existed on a *different* channel, and the refusal message named it: a lane's
+  own `columns[].collapsed` for collapsing, a `templates` component prop for
+  card templates, a `useColumnWidths` hook option for widths. Wiring a
+  board-level switch to any of them would be new behaviour and is not ordered
+  here. `CardTemplate` and `ColumnWidthConfig` stay exported — at this change,
+  the prop and the hook consumed the types.
+
+  ⚠️ **Dated note, 2026-09-25 — the `useColumnWidths` hook has since been
+  retired (objectui#8522), so the widths channel named above no longer exists
+  and `ColumnWidthConfig` has no `plugin-kanban` reader. `CardTemplate` is still
+  consumed, by the `CardTemplates` component's `templates` prop.**
 - **`titleField`** — ⚠️ **not** an inertness retirement, and reading it as one
   gets the mechanism backwards. `ObjectKanban` still reads the key and the read
   stays, because the **sibling `object-kanban` arm declares it and keeps it**
 
@@ -0,0 +1,33 @@
+---
+'@object-ui/plugin-kanban': minor
+---
+
+**BREAKING (scored `minor` per this repo's version-alignment convention)** —
+`useColumnWidths` is removed from `@object-ui/plugin-kanban`, together with its
+`UseColumnWidthsOptions` and `UseColumnWidthsReturn` types (objectui#8522,
+maintainer ruling: remove).
+
+The hook kept per-column widths in `localStorage`, and no kanban board read
+them: a board sizes its lanes from its own width (`columnInlineStyle` in
+`KanbanImpl`, derived on every render), and no kanban component accepts a
+per-lane width. The published 17.6.0 entry exports the hook and both types, so
+an import of it compiled and ran while changing nothing on screen.
+
+## Migration
+
+- `import { useColumnWidths } from '@object-ui/plugin-kanban'`, and the type
+  imports `UseColumnWidthsOptions` / `UseColumnWidthsReturn`, no longer resolve.
+  Delete the import and the call. Nothing replaces the hook, and removing the
+  call changes no rendered width, because no board ever consumed what it
+  returned.
+- The `localStorage` key `objectui:kanban-column-widths` (and its per-board form,
+  that key followed by `:` and the `storageKey` you passed) is no longer written
+  or read by any package. Values already stored in a browser are inert; remove
+  them if you want the storage back.
+- `ColumnWidthConfig` stays exported from `@object-ui/types` and from this
+  package. This change does not retire it.
+- The objectui#7742 entry in this same release (batch #70, the `kanban` arm)
+  names a `useColumnWidths` hook option as the channel for column widths. That
+  channel is gone with this change, and no other channel replaces it. This
+  change adds a dated note to that entry saying so, leaving its declaration
+  untouched.
@@ -72,8 +72,8 @@ type _RegistryIsReal = Assert<Equal<IsAny<SchemaRegistry>, false>>;
 //    `Equal` is invariant, so a re-declared twin that drifted by one member
 //    turns this red. (`KanbanSchema` was the third member of this row until
 //    objectui#8802 retired it with the bare `kanban` node key; the two that
-//    remain are consumed by `KanbanImpl`, `CardTemplates` and `useColumnWidths`
-//    and are NOT retired.)
+//    remain are consumed by `KanbanImpl` and `CardTemplates` and are NOT
+//    retired.)
 type _ColumnIsTheDeclaredOne = Assert<Equal<KanbanColumn, DeclaredKanbanColumn>>;
 type _CardIsTheDeclaredOne = Assert<Equal<KanbanCard, DeclaredKanbanCard>>;
 
 
@@ -0,0 +1,55 @@
+/**
+ * ObjectUI
+ * Copyright (c) 2024-present ObjectStack Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/**
+ * objectui#8522 — `useColumnWidths` is RETIRED from the package entry.
+ *
+ * The hook kept per-column widths in `localStorage` and no board read it: the
+ * rendered lane width comes from `KanbanImpl`'s `columnInlineStyle`, derived
+ * from the board's own width on every render. Ruled remove (a published
+ * capability with zero consumers retires immediately); the hook, its two option
+ * and return types, and its storage key went with it. ⛔ Resizable lanes are
+ * not rebuilt to keep it alive; if they are ever wanted, they come back as
+ * their own feature.
+ *
+ * What this pins is the entry's SHAPE, both halves:
+ *
+ *   - runtime: the hook name is not an own key of the module namespace, with a
+ *     sibling hook exported the same way and the board renderer as firing
+ *     controls on the same probe;
+ *   - compile time: the two type names do not resolve through the entry, with a
+ *     sibling hook's return type resolving through the same type query as the
+ *     control. Compiled by this package's `tsconfig.test.json` (chained off
+ *     `type-check`); an export that comes back fails there with
+ *     "Unused '@ts-expect-error' directive".
+ */
+
+import { describe, expect, it } from 'vitest';
+import * as entry from '../index';
+
+describe('@object-ui/plugin-kanban entry — useColumnWidths retired (objectui#8522)', () => {
+  it('no longer exports the hook, while live exports on the same probe still resolve', () => {
+    const keys = Object.keys(entry);
+    expect(keys).not.toContain('useColumnWidths');
+    // Firing controls: a hook exported the same way, and the board renderer.
+    // Without them an empty or mis-resolved namespace would pass the line above.
+    expect(typeof (entry as Record<string, unknown>).useCrossSwimlaneMove).toBe('function');
+    expect(keys).toContain('ObjectKanbanRenderer');
+  });
+
+  it('no longer exports the hook option and return types', () => {
+    // @ts-expect-error retired with the hook (objectui#8522). If the export
+    // comes back, tsc fails with "Unused '@ts-expect-error' directive".
+    type _OptionsRetired = import('../index').UseColumnWidthsOptions;
+    // @ts-expect-error retired with the hook (objectui#8522), as above.
+    type _ReturnRetired = import('../index').UseColumnWidthsReturn;
+    // Control: the same type query resolves a sibling hook's return type, so
+    // the two errors above are readings of the entry and not of a bad path.
+    type _SiblingResolves = import('../index').UseCrossSwimlaneMoveReturn;
+  });
+});
@@ -212,8 +212,6 @@ export { InlineQuickAdd } from './InlineQuickAdd';
 export type { InlineQuickAddProps } from './InlineQuickAdd';
 export { CardTemplates } from './CardTemplates';
 export type { CardTemplatesProps } from './CardTemplates';
-export { useColumnWidths } from './useColumnWidths';
-export type { UseColumnWidthsOptions, UseColumnWidthsReturn } from './useColumnWidths';
 export { useCrossSwimlaneMove } from './useCrossSwimlaneMove';
 export type { Swimlane, CrossSwimlaneMoveEvent, UseCrossSwimlaneOptions, UseCrossSwimlaneMoveReturn } from './useCrossSwimlaneMove';
 export { useQuickAddReorder } from './useQuickAddReorder';
 
@@ -246,8 +246,10 @@ export interface KanbanColumn {
  * documents.
  *
  * {@link KanbanCard}, {@link KanbanColumn}, {@link CardTemplate} and
- * {@link ColumnWidthConfig} are NOT retired — the renderer, the `CardTemplates`
- * component and the `useColumnWidths` hook still consume them.
+ * {@link ColumnWidthConfig} are NOT retired — the renderer and the
+ * `CardTemplates` component still consume the first three. The one
+ * `plugin-kanban` reader of {@link ColumnWidthConfig} was removed by
+ * objectui#8522, whose ruling did not reach the type itself.
  *
  * Pinned in `./__tests__/bare-kanban-node-key-retired-8802.test.ts`.
  */
 
@@ -3738,7 +3738,7 @@ export interface ObjectKanbanSchema extends BaseSchema {
    *
    * `id` / `title` / `cards` / `limit` / `className` / `collapsed` are exactly
    * the lane members the two board implementations read, counted off
-   * `KanbanImpl`, `KanbanEnhanced`, `useColumnWidths`, `useCrossSwimlaneMove`,
+   * `KanbanImpl`, `KanbanEnhanced`, `useCrossSwimlaneMove`,
    * `useQuickAddReorder` and `bucketCardsIntoColumns`. Their VALUE types come
    * from those read sites too — see {@link id} for the one this card had to
    * correct.
Original file line number	Diff line number	Diff line change
`@@ -246,8 +246,10 @@ export interface KanbanColumn {`
`246`	`246`	`* documents.`
`247`	`247`	`*`
`248`	`248`	`* {@link KanbanCard}, {@link KanbanColumn}, {@link CardTemplate} and`
`249`		- * {@link ColumnWidthConfig} are NOT retired — the renderer, the `CardTemplates`
`250`		- * component and the `useColumnWidths` hook still consume them.
	`249`	`+ * {@link ColumnWidthConfig} are NOT retired — the renderer and the`
	`250`	+ * `CardTemplates` component still consume the first three. The one
	`251`	+ * `plugin-kanban` reader of {@link ColumnWidthConfig} was removed by
	`252`	`+ * objectui#8522, whose ruling did not reach the type itself.`
`251`	`253`	`*`
`252`	`254`	* Pinned in `./__tests__/bare-kanban-node-key-retired-8802.test.ts`.
`253`	`255`	`*/`
Original file line number	Diff line number	Diff line change
`@@ -3738,7 +3738,7 @@ export interface ObjectKanbanSchema extends BaseSchema {`
`3738`	`3738`	`*`
`3739`	`3739`	* `id` / `title` / `cards` / `limit` / `className` / `collapsed` are exactly
`3740`	`3740`	`* the lane members the two board implementations read, counted off`
`3741`		- * `KanbanImpl`, `KanbanEnhanced`, `useColumnWidths`, `useCrossSwimlaneMove`,
	`3741`	+ * `KanbanImpl`, `KanbanEnhanced`, `useCrossSwimlaneMove`,
`3742`	`3742`	* `useQuickAddReorder` and `bucketCardsIntoColumns`. Their VALUE types come
`3743`	`3743`	`* from those read sites too — see {@link id} for the one this card had to`
`3744`	`3744`	`* correct.`