fix: remove redudant export for client plugin

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

@@ -3,6 +3,10 @@
  * sidebar slot; tree derivation materialized in a plugin-owned snapshot
  * store (pure consumer — no ctx service). Contract: api-contracts v3
  * section 6; props composition in contract/slots.ts.
+ *
+ * Export discipline: the public surface is the plugin body (apply/inject)
+ * plus the contract types. Implementation components and derivation live in
+ * their modules; tests reach them via src paths.
  */
 import type { RootBinding } from '@deepseek-ai/dsh-client-ui-slots'
 import type { ClientContext, SessionId } from '@deepseek-ai/dsh-client-runtime/client'
@@ -10,17 +14,6 @@ import type { SidebarRootInjected } from './contract/slots.ts'
 import { createSidebarTreeStore } from './store.ts'
 import { SidebarRoot } from './SidebarRoot.tsx'
 
-export {
-  deriveRows, formatRelativeTime, projectLabel,
-  UNGROUPED_KEY, UNGROUPED_LABEL,
-  type ProjectRow, type SessionRow, type SidebarRow, type TreeView,
-} from './tree.ts'
-export {
-  createSidebarTreeStore,
-  type GroupBy, type SidebarTreeState, type SidebarTreeStore,
-} from './store.ts'
-export { ProjectRowItem, SessionRowItem } from './Rows.tsx'
-export { SidebarRoot } from './SidebarRoot.tsx'
 export type {
   SidebarActions, SidebarRootComponentProps, SidebarRootInjected, SidebarTreeActions,
 } from './contract/slots.ts'