Trim redundant source comments

packages/client/ui-sidebar/tests/apply.spec.tsx

@@ -36,8 +36,7 @@ async function bench() {
   ctx.provide('sessions', sessions)
   ctx.provide('layout', layout)
   const slots = ctx.get('slots') as SlotsService
-  // Stand-in for ui-layout's root entry: the sidebar slot only exists while
-  // a live entry declares it in children (declaration account: design §2.2).
+  // The sidebar slot exists only while its declaring entry is live.
   slots.register(
     { name: 'root', children: { 'sidebar': { kind: 'single', scope: 'root' } } } as never,
     () => null,

packages/client/ui-sidebar/tests/sidebar-root.spec.tsx

@@ -10,8 +10,7 @@
 import { afterEach, describe, expect, it, vi } from 'vitest'
 import { cleanup, fireEvent, render, screen } from '@testing-library/react'
 import { act, useSyncExternalStore } from 'react'
-// Engine home: runtime/client since the store migration; the engine carries
-// no hook (runtime is React-free), so the spec binds the selector locally.
+// Runtime is React-free, so the spec binds its selector locally.
 import { createSnapshotStore } from '@deepseek-ai/dsh-client-runtime/client'
 import type { SessionId, SessionListState, SessionSummary } from '@deepseek-ai/dsh-client-runtime/client'
 import { SidebarRoot } from '../src/client/SidebarRoot.tsx'