AND-246: share Harness projects and history with Desktop

README.md

@@ -125,14 +125,15 @@ DSH Desktop (Electron Main)
 
 Electron userData
 ├── launch-root/
-├── logs/harness.log
-└── harness/
-    ├── profiles/
-    ├── sessions/
-    └── Plugins and user data
+└── logs/harness.log
+
+~/.dsh (shared with standalone Harness)
+├── profiles/
+├── sessions/
+└── Plugins and user data
 ```
 
-Harness runs in a separate Electron Node child process. The `--expose-internals` permission required by Cordis HMR is granted only to that child process and never to the web renderer.
+Production builds use Harness's canonical `~/.dsh` data home, so projects and conversation history remain available when switching between standalone Harness and DSH Desktop. Development builds remain isolated under Electron `userData`. Harness runs in a separate Electron Node child process. The `--expose-internals` permission required by Cordis HMR is granted only to that child process and never to the web renderer.
 
 ## Project structure
 

README.zh.md

@@ -125,14 +125,15 @@ DSH Desktop (Electron Main)
 
 Electron userData
 ├── launch-root/
-├── logs/harness.log
-└── harness/
-    ├── profiles/
-    ├── sessions/
-    └── 插件与用户数据
+└── logs/harness.log
+
+~/.dsh（与独立 Harness 共享）
+├── profiles/
+├── sessions/
+└── 插件与用户数据
 ```
 
-Harness 运行在独立的 Electron Node 子进程中。Cordis HMR 所需的 `--expose-internals` 只授予该子进程，不会授予 Web Renderer。
+正式版使用 Harness 标准的 `~/.dsh` 数据目录，因此在独立 Harness 和 DSH Desktop 之间切换时，项目与历史对话会保持可见。开发版仍隔离在 Electron `userData` 下。Harness 运行在独立的 Electron Node 子进程中。Cordis HMR 所需的 `--expose-internals` 只授予该子进程，不会授予 Web Renderer。
 
 ## 项目结构
 

src/main/index.ts

@@ -22,6 +22,7 @@ import {
 } from './plugin-recovery-detection'
 import { secureWindow } from './security'
 import { ensureLaunchRoot } from './state/launch-root'
+import { resolveDesktopHarnessHome } from './state/harness-home'
 import {
   resetPluginProfile,
   uninstallPluginFromProfile
@@ -161,6 +162,10 @@ function isDevelopmentBuild(): boolean {
 
 const developmentBuild = isDevelopmentBuild()
 
+function harnessHome(): string {
+  return resolveDesktopHarnessHome(app.getPath('userData'), developmentBuild)
+}
+
 function windowsTitleBarOverlay(isDark: boolean): Electron.TitleBarOverlayOptions {
   return {
     color: '#00000000',
@@ -292,7 +297,7 @@ function dshBrandLogoPath(variant: 'light' | 'dark'): string {
 function harnessLocale(): 'en' | 'zh' {
   try {
     const settings = parse(
-      readFileSync(join(app.getPath('userData'), 'harness', 'settings.yaml'), 'utf8')
+      readFileSync(join(harnessHome(), 'settings.yaml'), 'utf8')
     ) as { locale?: { preference?: unknown } }
     return resolveHarnessLocale(
       settings.locale?.preference,
@@ -310,7 +315,7 @@ function configureApplicationLocale(): void {
 function harnessThemePreference(): 'light' | 'dark' | 'system' {
   try {
     const settings = parse(
-      readFileSync(join(app.getPath('userData'), 'harness', 'settings.yaml'), 'utf8')
+      readFileSync(join(harnessHome(), 'settings.yaml'), 'utf8')
     ) as { 'ui-theme'?: { preference?: unknown } }
     const preference = settings['ui-theme']?.preference
     return preference === 'light' || preference === 'dark' || preference === 'system'
@@ -625,7 +630,7 @@ async function showPluginRecovery(options?: {
   if (failureRecoveryVisible || quitting) return
   failureRecoveryVisible = true
 
-  const dshHome = join(app.getPath('userData'), 'harness')
+  const dshHome = harnessHome()
   const isChinese = harnessLocale() === 'zh'
   cancelPluginRecoverySessionReset()
   const removedPlugins = pluginRecoveryRemovedPlugins
@@ -913,7 +918,7 @@ async function bootstrap(): Promise<void> {
     nodeExecutablePath: bundledNodePath(),
     nodeEntryPath: harnessNodeEntryPath(),
     dshPatchPath: desktopResourcePath('dsh-desktop.patch.yml'),
-    dshHome: join(app.getPath('userData'), 'harness'),
+    dshHome: harnessHome(),
     logPath: join(app.getPath('logs'), 'harness.log'),
     launchProcess: (executablePath, args, options) => spawn(executablePath, args, options),
     onChanged: (snapshot) => {
@@ -989,7 +994,7 @@ async function bootstrap(): Promise<void> {
     if (pluginName !== undefined && typeof pluginName !== 'string') {
       throw new Error('The failing plugin name must be a string.')
     }
-    const dshHome = join(app.getPath('userData'), 'harness')
+    const dshHome = harnessHome()
     await resetPluginProfile(dshHome, pluginName)
     await launchHarness()
     return { ok: runtime.snapshot().phase === 'ready' }

src/main/state/harness-home.ts

@@ -0,0 +1,17 @@
+import { homedir } from 'node:os'
+import { join } from 'node:path'
+
+/**
+ * Resolve the Harness data root used by the desktop shell.
+ *
+ * Production shares Harness's canonical ~/.dsh home so projects, sessions,
+ * credentials, and presets remain available when switching between the CLI
+ * and Desktop. Development builds stay isolated from real user data.
+ */
+export function resolveDesktopHarnessHome(
+  userDataPath: string,
+  developmentBuild: boolean,
+  homeDirectory = homedir()
+): string {
+  return developmentBuild ? join(userDataPath, 'harness') : join(homeDirectory, '.dsh')
+}

test/harness-home.test.ts

@@ -0,0 +1,16 @@
+import { describe, expect, it } from 'vitest'
+import { resolveDesktopHarnessHome } from '../src/main/state/harness-home'
+
+describe('Desktop Harness home', () => {
+  it('shares the canonical Harness home in production', () => {
+    expect(resolveDesktopHarnessHome('/app-data/dsh-desktop', false, '/users/alex')).toBe(
+      '/users/alex/.dsh'
+    )
+  })
+
+  it('keeps development builds isolated under Electron userData', () => {
+    expect(resolveDesktopHarnessHome('/app-data/dsh-desktop-dev', true, '/users/alex')).toBe(
+      '/app-data/dsh-desktop-dev/harness'
+    )
+  })
+})