refactor(client): name the compile face in every client test filename

A test file under packages/client now says which face it covers:
`*.client.spec.{ts,tsx}` and its `*.client.{ts,tsx}` helpers belong to the
Client aggregate, `*.host.spec.ts` to the host aggregate. The carrier's four
node-half specs take the Host suffix.

The two suffixes are mutually exclusive, so each aggregate excludes the
other's and both keep one broad test glob: `exclude` wins over `include`, and
`packages/client/**` no longer has to be excluded wholesale from the host
program with per-file `files` entries carved back out of it. A Host-face spec
that reaches only Host source therefore needs no cross-face project
reference, which the split-project rule rejects.

vitest still discovers every file through `**/*.spec.{ts,tsx}`.

packages/client/ui-conversation/tests/chat-branch-tails.client.spec.tsx

@@ -24,7 +24,7 @@ import {
 import { AssistantMarkdown } from '../src/client/chat/AssistantMarkdown.tsx'
 import { StatsLine, type StatsLineProps } from '../src/client/chat/StatsLine.tsx'
 import { zh } from '../src/client/locales.ts'
-import { chatSnapshotFixture } from './chat-snapshot-fixture.ts'
+import { chatSnapshotFixture } from './chat-snapshot-fixture.client.ts'
 
 /** jsdom has no ResizeObserver; StatsLine watches its row for ellipsis truncation through one. */
 class ResizeObserverStub {

packages/client/ui-conversation/tests/chat-stats.client.spec.tsx

@@ -14,7 +14,7 @@ import { en as commonEn } from '@deepseek-ai/dsh-client-locale/src/locales/en.ts
 import { zh as commonZh } from '@deepseek-ai/dsh-client-locale/src/locales/zh.ts'
 import { StatsLine, contextOccupancy, deriveStats, formatDuration, formatTokens, type StatsLineProps } from '../src/client/chat/StatsLine.tsx'
 import { en, zh } from '../src/client/locales.ts'
-import { chatSnapshotFixture } from './chat-snapshot-fixture.ts'
+import { chatSnapshotFixture } from './chat-snapshot-fixture.client.ts'
 
 // Mirrors the real lookup chain (conversation namespace, then common).
 const t: StatsLineProps['t'] = makeTranslate(zh, commonZh)

packages/client/ui-conversation/tests/chat-view.client.spec.tsx

@@ -32,7 +32,7 @@ import {
 } from '../src/client/chat/MessageItem.tsx'
 import { TurnTailNodeView } from '../src/client/chat/TurnTailNodeView.tsx'
 import { formatRunDuration } from '../src/client/chat/message-chrome.ts'
-import { chatSnapshotFixture } from './chat-snapshot-fixture.ts'
+import { chatSnapshotFixture } from './chat-snapshot-fixture.client.ts'
 
 afterEach(() => {
   cleanup()

packages/client/ui-conversation/tests/gate-branch-tails.client.spec.tsx

@@ -17,7 +17,7 @@ import { AssistantMarkdown, type AssistantMarkdownProps } from '../src/client/ch
 import { StatsLine } from '../src/client/chat/StatsLine.tsx'
 import { DetailsPanel } from '../src/client/skeleton/DetailsPanel.tsx'
 import { zh } from '../src/client/locales.ts'
-import { chatSnapshotFixture } from './chat-snapshot-fixture.ts'
+import { chatSnapshotFixture } from './chat-snapshot-fixture.client.ts'
 
 // Mirrors the real lookup chain (conversation namespace, then common).
 const t: AssistantMarkdownProps['t'] = makeTranslate(zh, commonZh)

packages/client/ui-conversation/tests/input-scenarios.client.spec.tsx

@@ -16,7 +16,7 @@ import {
 } from '@deepseek-ai/dsh-client-runtime/client'
 import { SlashService } from '@deepseek-ai/dsh-client-ui-slash/client'
 import type { ClientSessionContext, CommandClaim, PickOutcome, SubmitOutcome } from '@deepseek-ai/dsh-client-ui-slash/client'
-import { FakeApiClient, fakeRemote, ok } from '../../runtime/tests/fake-api.ts'
+import { FakeApiClient, fakeRemote, ok } from '../../runtime/tests/fake-api.client.ts'
 import { makeTranslate } from '@deepseek-ai/dsh-client-test-runtime'
 import { zh as commonZh } from '@deepseek-ai/dsh-client-locale/src/locales/zh.ts'
 import { SessionInputShell } from '../src/client/input/facade.ts'