fix: describe saved fixed project models accurately

Projects with a saved fixed Runtime model could incorrectly claim to follow
the global Runtime configuration. Restore the fixed-model description while
keeping the simplified menu and the ability to return to inherited settings.
Model resolution, permissions, and remote Agent behavior are unchanged.

Validation: 3911 tests passed, 66 skipped; typecheck, lint, and release-note
validation passed. Added bilingual regressions for all three Agent Runtimes.

Release note: 项目已固定 Runtime 模型时，现在明确显示所用固定模型，不再误报为跟随全局设置。

docs/features/model-connections/progress.md

@@ -1,5 +1,17 @@
 # 模型连接请求定制进度
 
+## 2026-09-11：发布前固定模型说明修复
+
+- 项目已保存固定 Runtime 模型时，恢复显示实际固定模型的帮助文字，保留简化后的菜单；
+  规则见 [会话与项目 Runtime 选择](./ui-design.md#会话与项目-runtime-选择)。
+- `npm exec vitest run src/renderer/src/ProjectRuntimeSelector.test.tsx`：2 项通过，
+  覆盖中英文下 OpenCode、Continue、DeepSeek Harness 的固定选项及恢复跟随操作。
+- `npm test`：343 个文件、3,911 项通过，66 项按平台或手工/真实服务条件跳过；
+  `npm run typecheck`、`npm run lint`、`npm run release:notes:verify` 通过。
+- 本次新增修复仅影响 Renderer 帮助文字，未修改共享模型解析、Desktop-to-Agent 请求、
+  Agent 或 Runtime 启动实现；不需要单独远程修复。真实模型调用 0 次，未运行真实 Host
+  或桌面端到端模型会话。本地未构建或打包，发布候选生产构建由主分支 CI 验证。
+
 ## 2026-09-10：配置准确性修复
 
 - 通道直连回退修复已按[技术设计第 8 节](./technical-design.md#8-通道直连模型选择修复)

docs/features/model-connections/ui-design.md

@@ -37,6 +37,13 @@ OpenCode 与 DeepSeek Harness 不使用该值。
 - 文本域遵循标准键盘编辑、选择、复制和粘贴行为；保存继续使用设置页唯一的主保存操作。
 - 焦点边框、字体、间距、颜色和深浅主题全部复用全局语义令牌。
 
+## 会话与项目 Runtime 选择
+
+会话与项目选择器只提供直连模型和各 Runtime 入口，不再枚举每个 Runtime 与每个模型的
+组合；Runtime 模型在系统设置中配置。已保存的固定 Runtime 模型选择继续保留，项目
+选择器的选项与帮助文字均显示其固定模型，不能误报为跟随全局设置；用户可选择普通
+Runtime 入口恢复跟随。该展示规则不改变模型解析、远程 Agent 协议或执行权限。
+
 ## Harness 模型来源展示
 
 DeepSeek Harness 的 `platform` 选项命名为“管理员环境优先，回退 GoodBuddy 兼容连接”，

src/renderer/src/ProjectRuntimeSelector.test.tsx

@@ -0,0 +1,51 @@
+import { cleanup, fireEvent, render, screen } from '@testing-library/react'
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import { defaultRuntimeSettings, type RuntimeSettings } from '../../shared/contracts'
+import { ProjectRuntimeSelector } from './ProjectRuntimeSelector'
+import i18n from './i18n'
+
+afterEach(cleanup)
+
+describe('ProjectRuntimeSelector saved model references', () => {
+  it.each(['zh-CN', 'en-US'])('describes fixed selections accurately in %s without restoring duplicate menus', async (language) => {
+    await i18n.changeLanguage(language)
+    const profileId = '00000000-0000-4000-8000-000000000011'
+    const settings = {
+      ...defaultRuntimeSettings,
+      defaultModelProfileId: profileId,
+      modelProfiles: [{
+        id: profileId, name: 'Model A', modelName: 'model-a',
+        baseUrl: 'https://example.com/v1', protocol: 'openai-chat-completions',
+        authentication: 'api-key', apiKeyConfigured: true
+      }]
+    } as RuntimeSettings
+    const onChange = vi.fn()
+    for (const provider of ['opencode', 'continue', 'deepseek-harness'] as const) {
+      const runtime = provider === 'opencode' ? 'OpenCode'
+        : provider === 'continue' ? 'Continue' : 'DeepSeek Harness'
+      const props = {
+        ariaLabel: 'Project Runtime', label: 'Runtime', onChange,
+        runtimeSettings: settings
+      }
+      const view = render(<ProjectRuntimeSelector {...props} selection={{ provider, profileId }} />)
+      const select = screen.getByRole('combobox')
+      expect(select).toHaveValue(`${provider}:${profileId}`)
+      expect(screen.getByText(language === 'zh-CN'
+        ? `通过 ${runtime} 运行，固定使用 Model A。`
+        : `Run through ${runtime} with the fixed model Model A.`)).toBeInTheDocument()
+      expect(screen.getAllByRole('option').filter((option) =>
+        (option as HTMLOptionElement).value.endsWith(`:${profileId}`))).toHaveLength(2)
+
+      fireEvent.change(select, { target: { value: `${provider}:default` } })
+      expect(onChange).toHaveBeenLastCalledWith({ provider })
+      view.rerender(<ProjectRuntimeSelector {...props} selection={{ provider }} />)
+      expect(select).toHaveValue(`${provider}:default`)
+      expect(screen.queryByText(language === 'zh-CN'
+        ? `通过 ${runtime} 运行，固定使用 Model A。`
+        : `Run through ${runtime} with the fixed model Model A.`)).not.toBeInTheDocument()
+      expect(screen.getAllByRole('option').filter((option) =>
+        (option as HTMLOptionElement).value.endsWith(`:${profileId}`))).toHaveLength(1)
+      view.unmount()
+    }
+  })
+})

src/renderer/src/ProjectRuntimeSelector.tsx

@@ -54,6 +54,15 @@ function runtimeSelectionDescription(
       : selection.provider === 'continue'
         ? 'Continue'
         : 'DeepSeek Harness'
+  if (selection.profileId) {
+    const profile = settings.modelProfiles.find(
+      (candidate) => candidate.id === selection.profileId
+    )
+    return t('channels.project.fixedRuntimeDescription', {
+      runtime: runtimeLabel,
+      name: profile?.name ?? t('channels.project.missingProfile')
+    })
+  }
   return t('channels.project.runtimeDescription', {
     runtime: runtimeLabel
   })

src/renderer/src/i18n/locales/en-US/integrations.ts

@@ -46,6 +46,7 @@ export const integrations = {
       directDescription:
         'Process messages directly with {{name}} ({{modelName}}).',
       defaultDirect: 'Direct · Follow the global default model',
+      fixedRuntimeDescription: 'Run through {{runtime}} with the fixed model {{name}}.',
       automaticDescription:
         'Follow the global default Runtime setting.',
       runtimeDescription:

src/renderer/src/i18n/locales/zh-CN/integrations.ts

@@ -40,6 +40,7 @@ export const integrations = {
         '直接使用 {{name}}（{{modelName}}）处理消息。',
       automaticDescription: '跟随全局 Runtime 默认设置',
       defaultDirect: '直连 · 跟随全局默认模型',
+      fixedRuntimeDescription: '通过 {{runtime}} 运行，固定使用 {{name}}。',
       runtimeDescription:
         '通过 {{runtime}} Agent Runtime 运行，并跟随“Agent Runtime”设置中的全局 {{runtime}} 配置。',
       defaultMode: '默认模式',