Revert "fix: remove redudant export for client plugin"

This reverts commit 48b259100b9cfe2e372eb9fe0924a783988f5a8e.

packages/client/ui-layout/README.md

@@ -2,9 +2,7 @@
 
 Shell plugin: three-column AppFrame (drag handles, concession chain) + ctx.layout viewing-state service (nav, panel widths, persist); defines the sidebar/conversation/details/conversation.empty slots. Contract: api-contracts v3 §5.
 
-Slot declarations use the composed-props entry form (`owner` share, no full `props`): the exported OwnerShare contracts are `SidebarOwnerProps` / `ConvOwnerProps` / `DetailsOwnerProps` / `EmptyOwnerProps` — registrants reference them via `OwnerOf<'sidebar' | ...>` and compose their own injected share locally. No entry declares `children` (declaring it requires the registered component to carry the slots face): no P-I slot component delegates — `conversation.empty` is rendered by the shell's assembly closure, not handed down by ConversationRoot.
-
-The export surface is the cross-package contract only: the AppFrame trio (+ `AppFrameProps`) consumed by the web shell's assembly, `LayoutService` with its store shapes (`NavState`/`PanelState`/`ViewId`), and the OwnerShare contracts. The concession-chain solver (`computeColumns`) and its geometry constants are package-internal; tests import them from `/src`.
+Slot declarations use the composed-props entry form (`owner` share, no full `props`): the exported OwnerShare contracts are `SidebarOwnerProps` / `ConvOwnerProps` / `DetailsOwnerProps` / `EmptyOwnerProps` — registrants reference them via `OwnerOf<'sidebar' | ...>` and compose their own injected share locally. The `conversation` entry authorizes `conversation.empty` delegation through `children`.
 
 ## Model Experience
 

packages/client/ui-layout/src/client/index.ts

@@ -10,13 +10,12 @@ import type { Context } from 'cordis'
 import type { SessionId } from '@deepseek-ai/dsh-client-runtime/client'
 import { LayoutService } from './service.ts'
 
-// Contract surface only (export-convergence rule: cross-package consumers
-// keep a symbol exported; test-only/package-internal symbols live off /src).
-// AppFrame trio + AppFrameProps: consumed by the web shell's assembly closure.
-// LayoutService: the ctx.layout service class (consumers type against it).
-// PanelState rides AppFrameProps' hooks; NavState/ViewId are service-store
-// shapes referenced through LayoutService's members.
 export { AppFrame, CenterColumn, DetailsColumn, type AppFrameProps } from './AppFrame.tsx'
+export {
+  clampWidth, computeColumns,
+  CENTER_MIN, DETAILS_DEFAULT, DETAILS_MAX, DETAILS_MIN, SIDEBAR_DEFAULT, SIDEBAR_MAX, SIDEBAR_MIN,
+  type Columns, type PanelInput,
+} from './columns.ts'
 export { LayoutService, type NavState, type PanelState, type ViewId } from './service.ts'
 
 declare module 'cordis' {

packages/client/ui-layout/tests/app-frame.spec.tsx

@@ -10,7 +10,7 @@ import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import { act, cleanup, render } from '@testing-library/react'
 import { createSnapshotStore } from '@deepseek-ai/dsh-client-web-react'
 import { AppFrame, CenterColumn, DetailsColumn, type PanelState } from '@deepseek-ai/dsh-client-ui-layout/client'
-import { clampWidth } from '@deepseek-ai/dsh-client-ui-layout/src/client/columns.ts'
+import { clampWidth } from '@deepseek-ai/dsh-client-ui-layout/client'
 
 /** Observer stub: captures the callback so tests can fire resizes manually. */
 let fireResize: (() => void) | null = null

packages/client/ui-layout/tests/columns.spec.ts

@@ -2,7 +2,7 @@ import { describe, expect, it } from 'vitest'
 import {
   CENTER_MIN, clampWidth, computeColumns,
   DETAILS_DEFAULT, DETAILS_MIN, SIDEBAR_DEFAULT, SIDEBAR_MIN,
-} from '@deepseek-ai/dsh-client-ui-layout/src/client/columns.ts'
+} from '@deepseek-ai/dsh-client-ui-layout/client'
 
 const open = (width: number) => ({ open: true, width })
 const closed = (width: number) => ({ open: false, width })

packages/client/ui-layout/tests/service.spec.ts

@@ -9,8 +9,7 @@ import { beforeEach, describe, expect, it } from 'vitest'
 import type { Context } from 'cordis'
 import { createSnapshotStore } from '@deepseek-ai/dsh-client-web-react'
 import type { SessionId, SessionListState } from '@deepseek-ai/dsh-client-runtime/client'
-import { LayoutService } from '@deepseek-ai/dsh-client-ui-layout/client'
-import { DETAILS_DEFAULT, SIDEBAR_DEFAULT } from '@deepseek-ai/dsh-client-ui-layout/src/client/columns.ts'
+import { LayoutService, DETAILS_DEFAULT, SIDEBAR_DEFAULT } from '@deepseek-ai/dsh-client-ui-layout/client'
 
 function makeCtx() {
   const list = createSnapshotStore<SessionListState>({ ids: [], byId: {} })