Merge branch 'master' into feat/agent-action

.agents/notes/implemented/bug-fix/2026-07-29-web-details-session-lifecycle.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write .agents/notes/implemented/bug-fix/2026-07-29-web-details-session-lifecycle.md
+2026-07-29-web-details-session-lifecycle.md: d9e0255768f165bed0631b9324e971b57ec7dcae
+2026-07-29-web-details-session-lifecycle.zh.md: 09452ba80ff240ddca76df239b40ea661566f8e2

.agents/notes/implemented/bug-fix/2026-07-29-web-details-session-lifecycle.md

@@ -0,0 +1,29 @@
+# Agent Note: Web details follow the current Session lifecycle
+
+Status: implemented
+
+English | [中文](2026-07-29-web-details-session-lifecycle.zh.md)
+
+## Problem
+
+The details entry is Session-scoped, but its preferred grid width is root-scoped. Selecting a different Session replaced the details content without closing that root preference, so the new owner inherited stale viewing geometry. Hero and other unselected states render no Session-scoped details; they need a derived zero track without becoming false owners in the comparison.
+
+## Decision
+
+`AppFrame` reads the current Session id and its `blank` summary flag from the authoritative Session projection. It records the last non-blank selected id only when that Session can own details, so hero and other unselected states neither trigger closure nor replace the last Session owner; their rendered details track derives as zero without changing the stored preference. The first Session keeps the default details width; returning to the same Session restores its current width; selecting a different Session closes the root-scoped details preference through the layout store before paint. The per-Session chat selection remains owned by the session-scoped store described by the [slot system standard](../architecture/2026-07-22-slot-type-chain-implementation.md).
+
+The layout store is transient and starts details at its default width. It neither reads nor writes `localStorage`, so reload resets both panel widths and needs no Session-baseline exception. Manual close and reopen inside one unchanged Session retain their existing behavior. The lifecycle effect changes neither the [Workspace-owned New Session flow](../feature/2026-07-25-workspace-ui-product-flow.md), composer drafts, Session navigation, nor concession-chain resizing.
+
+## Alternatives considered
+
+**Close details in the New Session click handler.** Rejected because an unselected surface has no Session-scoped details and must not mutate geometry. Closure belongs to the later comparison between two defined Session owners.
+
+**Persist panel geometry per Session.** Rejected because the product contract needs stale context removed, not a new map of remembered widths. Per-Session geometry would also reopen details when users return, contrary to the chosen close-on-leave behavior.
+
+**Preserve persisted layout after the Session baseline is ready.** Rejected because it duplicates startup lifecycle in a presentation component solely to validate stale viewing state. Transient defaults make reload deterministic without a readiness flag.
+
+**Treat every current-projection change as a Session switch.** Rejected because startup materialization, hero, clearing selection, and invalidation are not transitions between two Session owners.
+
+## Consequences
+
+Details is open by default, including when the first Session materializes. Switching to a different Session forgets the dragged details width because close writes zero and reopen uses the contract default. Unselected states derive a zero rendered track while leaving the preferred geometry unchanged; returning to the same Session through one of those states restores its width. Reload forgets sidebar and details geometry. The layout behavior test covers initial defaults, first materialization, direct and hero-mediated Session switches, same-Session return, and the absence of layout storage; the keyless browser e2e drives the same owner transitions through the shipped composition while checking the full grid track and browser errors.

.agents/notes/implemented/bug-fix/2026-07-29-web-details-session-lifecycle.zh.md

@@ -0,0 +1,29 @@
+# Agent Note: Web 详情栏遵循当前会话生命周期
+
+Status: implemented
+
+[English](2026-07-29-web-details-session-lifecycle.md) | 中文
+
+## 问题
+
+详情入口由会话作用域拥有，而其首选网格宽度由根作用域拥有。选择不同会话时，系统会替换详情内容，却不会关闭根作用域的该首选宽度，因此新 owner 会继承陈旧的查看几何信息。hero 和其他未选中状态不会渲染会话作用域的详情；其轨道需派生为零宽度，但不能因此在比较中成为伪 owner。
+
+## 决策
+
+`AppFrame` 从权威会话投影读取当前会话 id 及其摘要中的 `blank` 标志。它只在该会话能够拥有详情时记录最后一个选中的非 blank 会话 id，因此 hero 和其他未选中状态既不会触发关闭，也不会替换最后一个会话 owner；这些状态下，详情栏轨道的渲染宽度派生为零，但存储的首选宽度不变。首个会话保留详情栏的默认宽度；返回同一会话时恢复其当前宽度；选择不同会话时，系统会先通过布局 store 关闭根作用域存储的详情栏首选宽度，再进行绘制。逐会话的聊天选中项继续由 [slot 体系标准](../architecture/2026-07-22-slot-type-chain-implementation.md)所述的会话作用域 store 拥有。
+
+布局 store 是瞬时状态，详情栏以默认宽度启动。它既不读取也不写入 `localStorage`，因此重新加载会重置两个面板的宽度，无需会话基线例外。在同一个未变化的会话内手动关闭和重新打开详情栏，仍保持原有行为。该生命周期 effect 不改变 [Workspace 拥有的 New Session 动线](../feature/2026-07-25-workspace-ui-product-flow.md)、composer 草稿、会话导航或让步链缩放。
+
+## 考虑过的替代方案
+
+**在 New Session 点击处理器中关闭详情栏。** 之所以否决：未选中表面没有会话作用域的详情，不得修改几何信息。详情栏是否关闭，应由随后对两个已定义会话 owner 的比较决定。
+
+**按会话持久化面板几何信息。** 之所以否决：产品契约需要移除陈旧上下文，而不是新增一张保存各宽度的映射。按会话保存几何信息还会在用户返回时重新打开详情栏，与选定的离开即关闭行为相悖。
+
+**在会话基线就绪后保留持久化布局。** 之所以否决：这会仅为验证陈旧的查看状态，在呈现组件中重复实现启动生命周期。瞬时默认值无需就绪标志即可使重新加载具有确定性。
+
+**将当前投影的每次变化都视为会话切换。** 之所以否决：启动时的物化、hero、清除选中项和选中状态失效都不是两个会话 owner 之间的过渡。
+
+## 后果
+
+详情栏默认打开，首次会话物化时亦然。切换到不同会话会忘记拖动后的详情宽度，因为关闭操作会写入零值，重新打开时则使用契约默认值。未选中状态会将轨道的渲染宽度派生为零，同时保持首选几何信息不变；经由这些状态返回同一会话时，会恢复其宽度。重新加载会忘记侧边栏与详情栏的几何信息。布局行为测试覆盖初始默认值、首次物化、直接及经 hero 中转的会话切换、返回同一会话，以及不存在布局存储的情况；无密钥浏览器 e2e 则通过已交付的组合驱动相同的 owner 过渡，同时检查完整网格轨道和浏览器错误。

.agents/notes/implemented/process/2026-07-27-worktree-local-lefthook.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/process/2026-07-27-worktree-local-lefthook.md
-2026-07-27-worktree-local-lefthook.md: d18f6c1bf8fe240759ad48f67ca6b231000eaf2c
-2026-07-27-worktree-local-lefthook.zh.md: 42a1625a3b2ec7b00942dc46b0c9c64058ecd2fc
+2026-07-27-worktree-local-lefthook.md: 75dfd47087356c34005ec4673e174e451a72c660
+2026-07-27-worktree-local-lefthook.zh.md: bc4902769561c3d33d2101de55e28e70d114f39b

.agents/notes/implemented/process/2026-07-27-worktree-local-lefthook.md

@@ -16,9 +16,9 @@ Hook installation is worktree-scoped. With `CI=true` or `GITHUB_ACTIONS=true`, t
 
 Before upgrading format 0, the installer refuses direct common-config `extensions.*`; it also refuses direct `core.worktree` or `core.bare=true` and non-empty dormant worktree configs that enabling the extension would activate. The migration removes direct `core.bare=false` because false is Git's default. The common repository config and every existing `config.worktree` must be regular files. These checks disable include expansion because Git's repository-format parser also ignores included targets. A repository-scoped lock serializes migration and hook writes; its process ID, random token, file identity, and exact contents must still match at release. Dead or invalid locks require manual recovery rather than automatic breaking.
 
-Each hook directory carries a JSON ownership marker containing the absolute path last published to worktree config. After a checkout moves, that marker permits replacement of only the exact stale owned value. Before Lefthook runs, the marker and every existing generated hook must be unaliased regular files. The installer resolves the effective scope, origin, and value of `core.hooksPath`, including active `config.worktree` includes; it refuses command-scoped paths, unowned worktree-scoped paths, and unowned reserved directories. An inherited system, global, or common-repository path requires `DSH_LEFTHOOK_ALLOW_HOOKS_PATH_OVERRIDE=1`, which opts only the current worktree into Lefthook. Inactive `includeIf` targets are not recursively inspected because they do not affect the current configuration. Command-scoped Git configuration is removed from the Lefthook subprocess environment after validation.
+Each hook directory carries a JSON ownership marker containing the absolute path last published to worktree config. After a checkout moves, that marker permits replacement of only the exact stale owned value. Git seeds a new linked worktree's `config.worktree` from the main worktree; when that seed contains the marker-backed reserved hook path of a registered worktree, the installer replaces only the new worktree's config with its own path. Before Lefthook runs, the marker and every existing generated hook must be unaliased regular files. The installer resolves the effective scope, origin, and value of `core.hooksPath`, including active `config.worktree` includes; it refuses command-scoped paths, unowned worktree-scoped paths, and unowned reserved directories. An inherited system, global, or common-repository path requires `DSH_LEFTHOOK_ALLOW_HOOKS_PATH_OVERRIDE=1`, which opts only the current worktree into Lefthook. Inactive `includeIf` targets are not recursively inspected because they do not affect the current configuration. Command-scoped Git configuration is removed from the Lefthook subprocess environment after validation.
 
-If Lefthook fails after changing `core.hooksPath`, the installer restores the previous worktree value; a rollback failure is reported alongside the installation failure. Existing files in `$GIT_COMMON_DIR/hooks` are never removed or rewritten. Focused installer tests pin isolation, migration refusal, ownership and relocation, concurrent installation, custom paths, and rollback.
+If Lefthook fails after changing `core.hooksPath`, the installer restores the previous worktree value; a rollback failure is reported alongside the installation failure. Existing files in `$GIT_COMMON_DIR/hooks` are never removed or rewritten. Focused installer tests pin isolation, copied new-worktree configuration, migration refusal, ownership and relocation, concurrent installation, custom paths, and rollback.
 
 ## Alternatives considered
 

.agents/notes/implemented/process/2026-07-27-worktree-local-lefthook.zh.md

@@ -16,9 +16,9 @@ Lefthook 生成的钩子会优先使用安装时从对应 worktree 记录的绝
 
 升级格式 0 之前，安装程序会拒绝共用配置中直接设置的 `extensions.*`；它还会拒绝直接设置的 `core.worktree` 或 `core.bare=true`，以及启用扩展后将被激活的非空且尚未生效的 worktree 配置。迁移会移除直接设置的 `core.bare=false`，因为 false 是 Git 的默认值。共用仓库配置和每个已有的 `config.worktree` 都必须是常规文件。这些检查会禁用 include 展开，因为 Git 的仓库格式解析器也会忽略 include 目标。仓库级锁会串行化迁移和钩子写入；释放时，锁的进程 ID、随机令牌、文件身份和完整内容必须仍然匹配。所属进程已结束或内容无效的锁必须手动恢复，不会被自动破坏。
 
-每个钩子目录都有一个 JSON 所有权标记，其中包含上次写入 worktree 配置的绝对路径。检出目录移动后，该标记只允许替换确切的陈旧自有值。Lefthook 运行前，所有权标记和每个已有的生成钩子都必须是不带别名的常规文件。安装程序会解析 `core.hooksPath` 的生效作用域、来源和值，包括通过当前生效的 `config.worktree` include 加载的值；它会拒绝命令作用域路径、非自有的 worktree 作用域路径以及非自有的保留目录。继承自系统、全局或共用仓库配置的路径必须设置 `DSH_LEFTHOOK_ALLOW_HOOKS_PATH_OVERRIDE=1`，从而只让当前 worktree 显式启用 Lefthook。未生效的 `includeIf` 目标不会被递归检查，因为它们不影响当前配置。完成验证后，Lefthook 子进程的环境会移除命令作用域的 Git 配置。
+每个钩子目录都有一个 JSON 所有权标记，其中包含上次写入 worktree 配置的绝对路径。检出目录移动后，该标记只允许替换确切的陈旧自有值。Git 会以主 worktree 的配置为新链接 worktree 初始化 `config.worktree`；当该初始配置包含某个已注册 worktree 中由所有权标记佐证的保留钩子路径时，安装程序只会在新 worktree 的配置中将其替换为新 worktree 自有的路径。Lefthook 运行前，所有权标记和每个已有的生成钩子都必须是不带别名的常规文件。安装程序会解析 `core.hooksPath` 的生效作用域、来源和值，包括通过当前生效的 `config.worktree` include 加载的值；它会拒绝命令作用域路径、非自有的 worktree 作用域路径以及非自有的保留目录。继承自系统、全局或共用仓库配置的路径必须设置 `DSH_LEFTHOOK_ALLOW_HOOKS_PATH_OVERRIDE=1`，从而只让当前 worktree 显式启用 Lefthook。未生效的 `includeIf` 目标不会被递归检查，因为它们不影响当前配置。完成验证后，Lefthook 子进程的环境会移除命令作用域的 Git 配置。
 
-若 Lefthook 在更改 `core.hooksPath` 后失败，安装程序会恢复先前的 worktree 值；若回滚失败，会与安装失败一并报告。`$GIT_COMMON_DIR/hooks` 中的现有文件绝不会被移除或改写。聚焦的安装程序测试固定了隔离、迁移拒绝、所有权和检出目录移动、并发安装、自定义路径及回滚行为。
+若 Lefthook 在更改 `core.hooksPath` 后失败，安装程序会恢复先前的 worktree 值；若回滚失败，会与安装失败一并报告。`$GIT_COMMON_DIR/hooks` 中的现有文件绝不会被移除或改写。聚焦的安装程序测试固定了隔离、复制的新 worktree 配置、迁移拒绝、所有权和检出目录移动、并发安装、自定义路径及回滚行为。
 
 ## 考虑过的替代方案
 

.agents/notes/implemented/testing/2026-07-24-web-gui-browser-e2e-lane.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/testing/2026-07-24-web-gui-browser-e2e-lane.md
-2026-07-24-web-gui-browser-e2e-lane.md: d9e0a9660ecd6aeb75e835e68f92c0a268423872
-2026-07-24-web-gui-browser-e2e-lane.zh.md: e8c7d1c4596f20d88bd08423549fb6a9f7b0654b
+2026-07-24-web-gui-browser-e2e-lane.md: ce59dcce270d548c91e3719eee8e9c83aea0c154
+2026-07-24-web-gui-browser-e2e-lane.zh.md: bad3dd15ed7b98cc17340666a6c1094d0de057b1

.agents/notes/implemented/testing/2026-07-24-web-gui-browser-e2e-lane.md

@@ -42,7 +42,7 @@ The typecheck plane split is structural: the host scaffold, its support module,
 
 ### Coverage contract
 
-The lane covers three behavior families. Live-turn scenarios pin ordinary tool execution, cancellation, non-retryable failure, transient retry, resident questions, and mid-turn steering; synchronization uses durable events, `whenIdle()`, or an explicit replay marker rather than delays. Cold-history scenarios seed through the real persistence API and cover history rendering, sidebar search, trajectory and waterfall views, and tool details without model calls. Browser-lifecycle scenarios cover first-send workspace materialization, reload recovery, layout persistence, theme and locale preferences, and workspace create/rename/view operations. Each family asserts the browser surface and the authoritative host state; a stray model call or under-consumed fixture fails teardown.
+The lane covers three behavior families. Live-turn scenarios pin ordinary tool execution, cancellation, non-retryable failure, transient retry, resident questions, and mid-turn steering; synchronization uses durable events, `whenIdle()`, or an explicit replay marker rather than delays. Cold-history scenarios seed through the real persistence API and cover history rendering, sidebar search, trajectory and waterfall views, and tool details without model calls. Browser-lifecycle scenarios cover first-send workspace materialization, reload recovery, layout reset, theme and locale preferences, and workspace create/rename/view operations. Each family asserts the browser surface and the authoritative host state; a stray model call or under-consumed fixture fails teardown.
 
 ### CI stance
 

.agents/notes/implemented/testing/2026-07-24-web-gui-browser-e2e-lane.zh.md

@@ -42,7 +42,7 @@ Web GUI 以一条真实组装链交付——chromium 页面 → client 插件 bu
 
 ### 覆盖契约
 
-该车道覆盖三类行为。实时轮次场景钉住普通工具执行、取消、不可重试失败、瞬态重试、常驻提问与轮次中途 steering；同步依赖持久事件、`whenIdle()` 或显式回放标记，而不使用延时。冷历史场景通过真实持久化 API 播种，在不调用模型的情况下覆盖历史渲染、侧栏搜索、Trajectory 与 Waterfall 视图及工具详情。浏览器生命周期场景覆盖首次发送时物化工作区、重新加载恢复、布局持久化、主题与语言偏好，以及工作区的创建、重命名和视图操作。每类场景都断言浏览器表面和权威的 host 状态；离群的模型调用或未耗尽的 fixture 会使拆卸失败。
+该车道覆盖三类行为。实时轮次场景钉住普通工具执行、取消、不可重试失败、瞬态重试、常驻提问与轮次中途 steering；同步依赖持久事件、`whenIdle()` 或显式回放标记，而不使用延时。冷历史场景通过真实持久化 API 播种，在不调用模型的情况下覆盖历史渲染、侧栏搜索、Trajectory 与 Waterfall 视图及工具详情。浏览器生命周期场景覆盖首次发送时物化工作区、重新加载恢复、布局重置、主题与语言偏好，以及工作区的创建、重命名和视图操作。每类场景都断言浏览器表面和权威的 host 状态；离群的模型调用或未耗尽的 fixture 会使拆卸失败。
 
 ### CI 立场
 

apps/web/tests/details-session-lifecycle.e2e.ts

@@ -0,0 +1,95 @@
+// Keyless browser regression for the details column's Session ownership.
+// The shipped composition retains geometry through unselected states and closes it only when a different Session takes ownership.
+import { readFile } from 'node:fs/promises'
+import { fileURLToPath } from 'node:url'
+import type { Browser, Page } from 'playwright'
+import { chromium } from 'playwright'
+import { afterAll, beforeAll, describe, expect, it, onTestFailed } from 'vitest'
+import {
+  fixtureUserPrompts, launchWebScaffold, seedSession, watchConsole, webSnapshotMode, type WebScaffold,
+} from './scaffold.ts'
+import { connectFreshWorkspace, saveFailureShot } from './support.ts'
+
+const FIXTURE = fileURLToPath(new URL('./snapshots/lifecycle-chrome/session.jsonl', import.meta.url))
+const SEED_FIXTURE = fileURLToPath(new URL('./snapshots/seeded-history/seed.jsonl', import.meta.url))
+const PROMPT = 'Reply with the single word LIGHTHOUSE and stop.'
+const MODE = webSnapshotMode()
+
+/** Last AppFrame grid track in CSS pixels. */
+async function detailsTrack(page: Page): Promise<number> {
+  return await appFrame(page).evaluate((element) => {
+    const tracks = getComputedStyle(element).gridTemplateColumns.split(' ')
+    return Number.parseFloat(tracks.at(-1) ?? 'NaN')
+  })
+}
+
+/** AppFrame is the only product element with an inline grid track template. */
+function appFrame(page: Page) {
+  return page.locator('[style*="grid-template-columns"]').first()
+}
+
+describe.skipIf(MODE === 'record')('web e2e: details panel follows the current Session lifecycle', () => {
+  let scaffold: WebScaffold
+  let browser: Browser
+  let page: Page
+  let tripwire: ReturnType<typeof watchConsole>
+
+  beforeAll(async () => {
+    const fixture = await readFile(FIXTURE, 'utf8')
+    expect(fixtureUserPrompts(fixture)).toEqual([PROMPT])
+    scaffold = await launchWebScaffold({ replayFixture: FIXTURE, paceMs: 5 })
+    await seedSession(scaffold, await readFile(SEED_FIXTURE, 'utf8'), 'details-session-lifecycle-seed')
+    browser = await chromium.launch()
+    page = await browser.newPage({ viewport: { width: 1680, height: 1000 } })
+    tripwire = watchConsole(page)
+    await page.goto(scaffold.baseUrl, { waitUntil: 'load' })
+    await appFrame(page).waitFor({ timeout: 30_000 })
+    await connectFreshWorkspace(page)
+  }, 120_000)
+
+  afterAll(async () => {
+    await browser?.close()
+    await scaffold?.close()
+  })
+
+  it('retains geometry through hero and closes it for a different Session', async () => {
+    onTestFailed(() => saveFailureShot(page, 'web-e2e-details-session-lifecycle'))
+    const settled = scaffold.whenTurnSettled()
+    const input = page.locator('textarea').first()
+    await input.fill(PROMPT)
+    await input.press('Enter')
+    await settled
+    await page.getByText('LIGHTHOUSE', { exact: true }).waitFor({ timeout: 15_000 })
+
+    await expect.poll(() => detailsTrack(page), { timeout: 5_000 }).toBe(360)
+    expect(await page.getByText('详情', { exact: true }).count()).toBe(1)
+
+    await page.getByRole('button', { name: 'New session', exact: true }).last().click()
+    await page.getByText("Let's start building", { exact: false }).waitFor({ timeout: 15_000 })
+    await expect.poll(() => detailsTrack(page), { timeout: 5_000 }).toBe(0)
+    expect(await page.getByText('详情', { exact: true }).isVisible()).toBe(false)
+
+    const original = page.locator('[role=treeitem]').filter({ hasText: 'Reply with the single word' }).first()
+    await original.click()
+    await page.getByText('LIGHTHOUSE', { exact: true }).waitFor({ timeout: 15_000 })
+    await expect.poll(() => detailsTrack(page), { timeout: 5_000 }).toBe(360)
+    expect(await page.getByText('详情', { exact: true }).count()).toBe(1)
+
+    const ungrouped = page.getByText('Ungrouped', { exact: true })
+    const ungroupedRow = ungrouped.locator('..').locator('..')
+    const ungroupedSection = ungroupedRow.locator('..')
+    await expect.poll(async () => {
+      if (await ungroupedRow.getAttribute('aria-expanded') !== 'true') {
+        await ungrouped.click()
+        await page.waitForTimeout(50)
+      }
+      return await ungroupedRow.getAttribute('aria-expanded')
+    }, { timeout: 5_000 }).toBe('true')
+    const seeded = ungroupedSection.locator('[role="treeitem"]').nth(1)
+    await seeded.click()
+    await page.getByText('DONE', { exact: true }).waitFor({ timeout: 15_000 })
+    await expect.poll(() => detailsTrack(page), { timeout: 5_000 }).toBe(0)
+    expect(tripwire.pageErrors).toEqual([])
+    expect(tripwire.warnings).toEqual([])
+  }, 90_000)
+})

apps/web/tests/lifecycle-chrome.e2e.ts

@@ -101,23 +101,15 @@ describe('web e2e: lifecycle & chrome (workspace flow / reload / dark mode)', ()
 
   it.skipIf(MODE === 'record')('recovers the whole surface across a reload from the log alone', async () => {
     onTestFailed(() => saveFailureShot(page, 'web-e2e-lifecycle-reload'))
-    // Fold a layout preference into the same reload: collapse the sidebar
-    // (persisted under dsh.layout.panels) before reloading.
-    await page.getByRole('button', { name: 'Collapse sidebar' }).click()
-    await expect.poll(() => page.getByRole('button', { name: 'Open sidebar' }).count(), { timeout: 10_000 }).toBe(1)
     const warningStart = tripwire.warnings.length
     await page.reload({ waitUntil: 'load' })
     await page.waitForSelector('[class*="frame"]', { timeout: 30_000 })
     acknowledgeReloadConnectionLoss(tripwire, warningStart)
-    // Layout persisted: the sidebar comes back collapsed.
-    await expect.poll(() => page.getByRole('button', { name: 'Open sidebar' }).count(), { timeout: 10_000 }).toBe(1)
     // Selection persisted (dsh.sessions.current) and history replayed: the
     // recorded turn re-renders from session.history with zero model calls —
     // the replay cursor was fully consumed before the reload, so any stray
     // request would fail the scenario loudly at close().
     await expect.poll(() => page.getByText('LIGHTHOUSE', { exact: true }).count(), { timeout: 15_000 }).toBeGreaterThanOrEqual(1)
-    // Expand back and confirm the tree still lists the materialized session.
-    await page.getByRole('button', { name: 'Open sidebar' }).click()
     await expect.poll(() => page.locator('[role="treeitem"][aria-selected="true"]').count(), { timeout: 10_000 }).toBe(1)
     // Golden of the recovered conversation region: rebuilt from the log, it
     // must render the same settled transcript the live turn produced.

apps/web/tests/smoke-real.e2e.ts

@@ -469,7 +469,7 @@ describe.skipIf(!process.env.DEEPSEEK_API_KEY || notReady.length > 0)('web smoke
     await screen(page, '09-details-closed')
   }, 150_000)
 
-  it('6 sidebar drag widens the column and persists across reload', async () => {
+  it('6 sidebar drag widens the column and resets across reload', async () => {
     onTestFailed(() => saveFailureShot(page, 'w5-drag'))
     const before = await firstTrack(page)
     const handle = page.locator('[class*="handle"]').first()
@@ -484,7 +484,7 @@ describe.skipIf(!process.env.DEEPSEEK_API_KEY || notReady.length > 0)('web smoke
     await screen(page, '10-sidebar-dragged')
     await page.reload({ waitUntil: 'load' })
     await page.waitForSelector('[class*="frame"]', { timeout: 30_000 })
-    expect(await firstTrack(page)).toBe(after)
+    expect(await firstTrack(page)).toBe(before)
   })
 
   it('7 dark mode: the body attribute cascades the token sheets', async () => {

apps/web/tsconfig.json

@@ -28,6 +28,7 @@
     "tests/steering.e2e.ts",
     "tests/navigation-panes.e2e.ts",
     "tests/lifecycle-chrome.e2e.ts",
+    "tests/details-session-lifecycle.e2e.ts",
     "tests/settings-chrome.e2e.ts",
     "tests/workspace-management.e2e.ts",
     "tests/replay-round-trip.e2e.ts",

docs/development.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write docs/development.md
-development.md: 32339fa2af8c1b6005d9e0b8165d57966a4145ca
-development.zh.md: c74a81346639c6f95568cbd86b401d134d5eb7fc
+development.md: 0a18e29d3da4f694707521e230017e6b22cad740
+development.zh.md: 885b51c701267215cc50d31ecd1694ae2c9af9ca

docs/development.md

@@ -27,7 +27,7 @@ If hooks are missing because dependencies were restored from cache or `postinsta
 node scripts/install-lefthook.mjs
 ```
 
-The wrapper refuses user-owned `core.hooksPath` values. An inherited system, global, or common-repository path requires `DSH_LEFTHOOK_ALLOW_HOOKS_PATH_OVERRIDE=1`; command-scoped and worktree-scoped custom paths must be integrated or removed explicitly.
+The wrapper refuses user-owned `core.hooksPath` values. An inherited system, global, or common-repository path requires `DSH_LEFTHOOK_ALLOW_HOOKS_PATH_OVERRIDE=1`. When Git seeds a new worktree with another registered worktree's marker-backed hook path, the wrapper replaces that copied value with the new worktree's own path; command-scoped and other worktree-scoped paths must be integrated or removed explicitly.
 
 Before enabling worktree config, migrate direct `extensions.*` in a format-0 common config, direct `core.worktree` or `core.bare=true`, and any non-empty dormant `config.worktree`. The common config and every worktree config must be regular files, while the owned hook directory may contain only unaliased regular files.
 

docs/development.zh.md

@@ -27,7 +27,7 @@ pnpm install
 node scripts/install-lefthook.mjs
 ```
 
-包装层会拒绝用户自有的 `core.hooksPath` 值。继承自系统、全局或共用仓库配置的路径必须设置 `DSH_LEFTHOOK_ALLOW_HOOKS_PATH_OVERRIDE=1`；命令作用域和 worktree 作用域的自定义路径必须显式集成或移除。
+包装层会拒绝用户自有的 `core.hooksPath` 值。继承自系统、全局或共用仓库配置的路径必须设置 `DSH_LEFTHOOK_ALLOW_HOOKS_PATH_OVERRIDE=1`。当 Git 使用另一个已注册 worktree 中由所有权标记佐证的钩子路径初始化新 worktree 时，包装层会将这个复制值替换为新 worktree 自有的路径；命令作用域和其他 worktree 作用域的路径必须显式集成或移除。
 
 启用 worktree 配置之前，请迁移格式 0 共用配置中直接设置的 `extensions.*`，并迁移直接设置的 `core.worktree` 或 `core.bare=true`，以及任何非空且尚未生效的 `config.worktree`。共用配置和每个 worktree 配置都必须是常规文件，而自有钩子目录只能包含不带别名的常规文件。
 

packages/client/ui-layout/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-layout/README.md
-README.md: 26e909b96412985792eeae72d51a2ab2a315c943
-README.zh.md: 2e5799fd32c41328f8ca8b9e1a439fbccb3cdba2
+README.md: 9354f4b79f7b1af7d8a20a295e77913ff443c2e4
+README.zh.md: c949236557e7eb3eed0c698566fb5aa9e9cdd18a

packages/client/ui-layout/README.md

@@ -4,7 +4,7 @@ English | [中文](README.zh.md)
 
 Shell plugin: three-column AppFrame (drag handles and concession chain) plus the `ctx.layout` panel-geometry service; it registers into the runtime-owned `root` slot and declares `sidebar`, `conversation`, `details`, and `conversation.empty`. The sidebar is fixed-width (only details shrinks, then auto-closes); a closed sidebar retains a 56px control rail while details closes to zero width. The package also seats the theme presenter: it consumes resolved `ctx.theme` snapshots and projects them onto the document (`html { color-scheme }` for native UA chrome, `body[data-ds-dark-theme]` from the active color scheme, plus the theme's alias tokens as inline variables on body).
 
-AppFrame reads the runtime Session projection: `baselinesReady` selects loading, a page-local `SessionListState.intent` selects the empty composer, and a connected Session renders through `SessionProvider`. The conversation and empty-state owner shares are empty; each registrant obtains business data from standard hooks and actions from its own inject face. The sidebar owner share contains only `collapsed` and `width`; navigation actions belong to sidebar's own injected service face.
+AppFrame always mounts the conversation and details columns; a connected Session renders through `SessionProvider`. The transient layout store starts both panels at their default widths and never reads or writes `localStorage`. Hero and other unselected states derive a zero rendered details width without changing that stored preference. AppFrame retains the last non-blank Session id across those states: the first Session opens at the default width, returning to the same Session restores its unchanged width, and selecting a different Session closes details before paint. The conversation owner share is empty, while the sidebar owner share contains only `collapsed` and `width`; registrants obtain business data from standard hooks and actions from their own inject faces.
 
 The `/client` export surface is the plugin body (`apply`/`inject`), `LayoutService`, and the four owner-share interfaces. AppFrame, the panel store, and the concession solver remain package-internal; tests import internals through `/src`.
 
@@ -18,6 +18,6 @@ None; this package neither assembles nor sends a provider request.
 
 ## Known Limitations and Deferred Work
 
-- **Details open/width state is global** — it does not follow the session (arbitrated for P-I); the per-session keyed upgrade slot is reserved.
-- **Concession-chain auto-close derives a zero width without touching the persisted open flag** — the panel restores itself when the window widens; consumers must not read `details.open` as the rendered truth.
+- **Panel geometry is transient** — reload restores both panels to their defaults; switching between distinct Session ids closes details and forgets its dragged width, while unselected surfaces render details at zero width without modifying geometry.
+- **Concession-chain auto-close derives a zero width without touching the preferred width** — the panel restores itself when the window widens; consumers must not read the stored details width as the rendered truth.
 - **Scroll anchoring during squeeze reflow is not implemented** — deferred with the virtualized-list project.

packages/client/ui-layout/README.zh.md

@@ -4,7 +4,7 @@
 
 外壳插件：三栏 AppFrame（拖动手柄与让步链）加 `ctx.layout` 面板几何服务；它注册到运行时拥有的 `root` slot，并声明 `sidebar`、`conversation`、`details` 和 `conversation.empty`。侧边栏宽度固定（只会收缩详情栏，然后将其自动关闭）；关闭的侧边栏仍保留 56px 控制轨道，详情栏则关闭到零宽度。该包还提供主题呈现器：它消费解析后的 `ctx.theme` 快照，并将其投影到 document（用 `html { color-scheme }` 驱动原生 UA 控件，依据当前配色方案设置 `body[data-ds-dark-theme]`，并将主题的别名 token 设为 body 上的内联变量）。
 
-AppFrame 读取运行时 Session 投影：`baselinesReady` 选择加载状态，页面局部的 `SessionListState.intent` 选择空白编辑器，已连接 Session 则通过 `SessionProvider` 渲染。会话及空状态的 owner share 为空；每个注册方通过标准 hook 获取业务数据，并从自身的 inject 表层获取操作。侧边栏 owner share 只包含 `collapsed` 和 `width`；导航操作属于侧边栏自身注入的服务表层。
+AppFrame 始终挂载会话栏和详情栏；已连接 Session 通过 `SessionProvider` 渲染。布局 store 是瞬时状态，两个面板均以默认宽度启动，且从不读写 `localStorage`。hero 和其他未选中状态会将详情栏的渲染宽度派生为零，但不会改变存储的首选宽度。AppFrame 会跨越这些状态保留最后一个非 blank 会话 id：首个会话以默认宽度打开；返回同一会话时恢复其未改变的宽度；选择不同会话时，详情栏会在绘制前关闭。会话 owner share 为空，侧边栏 owner share 只包含 `collapsed` 和 `width`；注册方通过标准钩子获取业务数据，并从各自的 inject 表层获取操作。
 
 `/client` 导出表层包含插件主体（`apply`／`inject`）、`LayoutService` 和四个 owner-share 接口。AppFrame、面板 store 与让步求解器仍属于包内部；测试通过 `/src` 导入内部实现。
 
@@ -18,6 +18,6 @@ AppFrame 读取运行时 Session 投影：`baselinesReady` 选择加载状态，
 
 ## 已知限制与暂缓事项
 
-- **详情栏打开／宽度状态是全局状态**：它不会随会话变化（P-I 已裁定）；为逐会话键控升级预留了 slot。
-- **让步链自动关闭通过推导零宽度实现，不会改动持久化的打开标志**：窗口变宽时面板会自行恢复；消费方禁止把 `details.open` 当作实际渲染状态。
+- **面板几何信息是瞬时状态**：重新加载会将两个面板恢复为默认值；在不同会话 id 之间切换会关闭详情栏，并忘记拖动后的宽度，而未选中表面会以零宽度渲染详情栏，但不会修改几何信息。
+- **让步链自动关闭通过推导零宽度实现，不会改动首选宽度**：窗口变宽时面板会自行恢复；消费方禁止把 store 中的详情宽度当作实际渲染状态。
 - **挤压重排期间尚未实现滚动锚定**：与虚拟化列表项目一并暂缓。

packages/client/ui-layout/src/client/AppFrame.tsx

@@ -10,7 +10,7 @@
  * through the three framework shares — zero cordis or framework imports,
  * zero self-made hooks.
  */
-import { useCallback, useEffect, useRef, useState } from 'react'
+import { useCallback, useEffect, useLayoutEffect, useRef, useState } from 'react'
 import type { ReactNode } from 'react'
 import type { PropsRenderSlots, PropsRuntime, PropsStore } from '@deepseek-ai/dsh-client-ui-slots'
 import { computeColumns } from './columns.ts'
@@ -86,13 +86,27 @@ function DragHandle(props: { side: 'sidebar' | 'details'; left: number; onStart:
 /** The three-column frame (see module doc). */
 export function AppFrame({
   useStore,
+  useSessions,
   actions,
   renderSlot,
 }: AppFrameProps) {
   const panels = useStore(s => s)
+  const detailsSession = useSessions((s) => {
+    const current = s.current
+    return current !== undefined && s.byId[current]?.blank === false ? current : undefined
+  })
   const frameRef = useRef<HTMLDivElement | null>(null)
   const [viewport, setViewport] = useState(() => window.innerWidth)
 
+  const lastSession = useRef(detailsSession)
+  useLayoutEffect(() => {
+    if (detailsSession === undefined) return
+    if (lastSession.current !== undefined && lastSession.current !== detailsSession) {
+      actions.closeDetails()
+    }
+    lastSession.current = detailsSession
+  }, [actions, detailsSession])
+
   // Track the frame's own box (not the window): rAF-throttled ResizeObserver.
   useEffect(() => {
     const el = frameRef.current
@@ -113,12 +127,12 @@ export function AppFrame({
     }
   }, [])
 
-  const cols = computeColumns(viewport, panels.sidebar, panels.details)
+  const cols = computeColumns(viewport, panels.sidebar, detailsSession === undefined ? 0 : panels.details)
   const colsRef = useRef(cols)
   colsRef.current = cols
 
   // The drag base is the rendered width captured at drag start (grabbing a
-  // concession-clamped panel must not jump back to the persisted preference);
+  // concession-clamped panel must not jump back to the stored preference);
   // it stays frozen for the whole gesture so dx deltas do not compound.
   const sidebarBase = useRef(0)
   const detailsBase = useRef(0)

packages/client/ui-layout/src/client/columns.ts

@@ -1,7 +1,7 @@
 /**
  * Pure concession-chain column solver for the three-column AppFrame.
  * Chain order is fixed by contract: keep center >= CENTER_MIN by shrinking
- * details, then auto-closing it (derived zero width — persisted width
+ * details, then auto-closing it (derived zero width — preferred width
  * preferences are never rewritten, so widening the window restores them).
  * The sidebar never concedes: its rendered width is always the drag
  * preference (or the collapsed rail), and center absorbs any remaining
@@ -45,8 +45,8 @@ export function clampWidth(px: number, min: number, max: number): number {
 /**
  * Solve the three column widths for one viewport frame. Pure: no hysteresis —
  * the output is a function of (viewport, preferences) only, so recovery on
- * re-widening is automatic. Preferences re-clamp here because they cross a
- * durable boundary (localStorage rehydration may carry stale ranges).
+ * re-widening is automatic. Preferences re-clamp here because they cross the
+ * store boundary and callers may still supply stale ranges.
  * @param viewport - available frame width in px.
  * @param sidebar - sidebar width preference in px (0 = closed).
  * @param details - details width preference in px (0 = closed).

packages/client/ui-layout/src/client/stores.ts

@@ -1,7 +1,7 @@
 /**
- * The root entry's layout store: panel geometry as plain widths in px
- * (0 = closed), persisted across reloads. Module level exports the factory
- * only — a module-level handle would pin the store's identity in the module
+ * The root entry's transient layout store: panel geometry as plain widths in
+ * px (0 = closed). Module level exports the factory only — a module-level
+ * handle would pin the store's identity in the module
  * cache (a de-facto singleton surviving plugin reloads). register() receives
  * the factory (exclusive use: the framework instantiates per entry), AppFrame
  * derives its PropsStore share from the return type, and the service face
@@ -29,17 +29,16 @@ type LayoutActions = {
 }
 
 /**
- * Create the layout panel store handle. The persisted preference IS the
- * width, so closing a panel forgets its drag width — reopening restores the
- * contract default. Actions are the complete write set: drag writes clamp
+ * Create the layout panel store handle. The preference IS the width, so
+ * closing a panel forgets its drag width — reopening restores the contract
+ * default. Actions are the complete write set: drag writes clamp
  * into the panel's contract range and never cross the open/closed line;
  * open/close transitions write 0 / the default explicitly.
  * @returns the store handle (spec + type + identity + factory in one).
  */
 export function createLayoutStore(): EngineStoreHandle<LayoutState, LayoutActions>  {
   const handle = defineStore({
-    init: (): LayoutState => ({ sidebar: SIDEBAR_DEFAULT, details: 0 }),
-    persist: 'dsh.layout.panels',
+    init: (): LayoutState => ({ sidebar: SIDEBAR_DEFAULT, details: DETAILS_DEFAULT }),
     actions: {
       setSidebar: (d, px: number) => { d.sidebar = clampWidth(px, SIDEBAR_MIN, SIDEBAR_MAX) },
       setDetails: (d, px: number) => { d.details = clampWidth(px, DETAILS_MIN, DETAILS_MAX) },

packages/client/ui-layout/src/invariant.ts

@@ -15,8 +15,8 @@ export const name = 'client-ui-layout-invariant'
 export const inject = ['invariants']
 
 /**
- * No runtime invariant: shell viewing-state stores (zustand+persist) behind
- * ctx.layout — it emits no cordis events; clamp/prune/concession-chain
+ * No runtime invariant: the shell viewing-state store behind ctx.layout emits
+ * no cordis events; clamp/prune/concession-chain
  * sequencing is asserted directly by this package's columns and service specs.
  */
 const install: InvariantInstaller = () => {}

packages/client/ui-layout/tests/app-frame.spec.tsx

@@ -21,8 +21,9 @@ import type {
   SessionId, SessionListState, WorkspaceListState,
 } from '@deepseek-ai/dsh-client-runtime/client'
 
-// Session-mode switch for the SessionProvider stub prop.
-const sessionMode = { current: true }
+// Session selection controls for the SessionProvider and useSessions stubs.
+const selectedSession = { current: 's-test' as SessionId | undefined }
+const selectedSessionBlank = { current: false }
 const baselinesReady = { current: true }
 
 // Render-prop contract stub fed through the standard seat prop (the renderer
@@ -31,7 +32,7 @@ const baselinesReady = { current: true }
 // shape. Typed as the seat's own component type so the branded sessionId
 // parameter stays contract-checked.
 const SessionProviderStub: AppFrameProps['SessionProvider'] = ({ children, empty }) =>
-  sessionMode.current ? <>{children('s-test' as Parameters<typeof children>[0])}</> : <>{empty?.() ?? null}</>
+  selectedSession.current === undefined ? <>{empty?.() ?? null}</> : <>{children(selectedSession.current)}</>
 
 
 /** Observer stub: captures the callback so tests can fire resizes manually. */
@@ -54,7 +55,6 @@ function hookOf<T>(inst: { subscribe: (fn: () => void) => () => void; getSnapsho
 function mountFrame() {
   window.innerWidth = frameWidth // first-render viewport source before the observer fires
   const instance = createLayoutStore().create()
-  instance.actions.openDetails() // seed: sidebar at default 280, details open at default 360
   const slotCalls: { key: string; props: unknown }[] = []
   const renderSlot = ((key: string, owner: object) => {
     slotCalls.push({ key, props: owner })
@@ -64,32 +64,35 @@ function mountFrame() {
     if (key === 'conversation.empty') return <div data-testid="empty-content" />
     return <div data-testid="other-content" />
   }) as AppFrameProps['renderSlot']
-  const sessionId = 's-test' as SessionId
-  const sessionState = {
-    ids: sessionMode.current ? [sessionId] : [],
-    byId: sessionMode.current
-      ? { [sessionId]: { id: sessionId, displayTitle: 'Test', running: false, blank: false, updatedAt: 1 } }
-      : {},
-    current: sessionMode.current ? sessionId : undefined,
-    phase: 'ready',
-  } as SessionListState
-  const useSessions = ((sel: (s: SessionListState) => unknown) => sel(sessionState)) as never
+  const useSessions = ((sel: (s: SessionListState) => unknown) => {
+    const current = selectedSession.current
+    const sessionState = {
+      ids: current === undefined ? [] : [current],
+      byId: current === undefined
+        ? {}
+        : { [current]: { id: current, displayTitle: 'Test', running: false, blank: selectedSessionBlank.current, updatedAt: 1 } },
+      current,
+      phase: 'ready',
+    } as SessionListState
+    return sel(sessionState)
+  }) as never
   const workspaceState: WorkspaceListState = {
     items: [], state: 'idle', phase: 'ready', error: null,
     baselinesReady: baselinesReady.current, recentWorkspaceId: undefined,
   }
-  const utils = render(
+  const element = () => (
     <AppFrame
-      useStore={hookOf(instance) as never}
+      useStore={hookOf(instance)}
       actions={instance.actions}
       renderSlot={renderSlot}
       useSessions={useSessions}
       useWorkspaces={((sel: (s: WorkspaceListState) => unknown) => sel(workspaceState)) as never}
       SessionProvider={SessionProviderStub}
-    />,
+    />
   )
+  const utils = render(element())
   const frame = utils.container.firstElementChild as HTMLElement
-  return { instance, frame, slotCalls, ...utils }
+  return { instance, frame, slotCalls, rerenderFrame: () => { utils.rerender(element()) }, ...utils }
 }
 
 function tracks(frame: HTMLElement): number[] {
@@ -109,9 +112,9 @@ function drag(handle: Element, fromX: number, toX: number): void {
 
 beforeEach(() => {
   frameWidth = 1920
-  sessionMode.current = true
+  selectedSession.current = 's-test' as SessionId
+  selectedSessionBlank.current = false
   baselinesReady.current = true
-  localStorage.clear() // the layout store persists; instances must not bleed across tests
   vi.useFakeTimers()
   vi.stubGlobal('ResizeObserver', ResizeObserverStub)
   vi.stubGlobal('requestAnimationFrame', (cb: FrameRequestCallback) => setTimeout(() => { cb(0) }, 16) as unknown as number)
@@ -154,7 +157,7 @@ describe('AppFrame', () => {
   it('keeps the conversation slot mounted while no session is current', () => {
     // No current session: the session-maybe conversation shell owns the New
     // Session view itself — the center column renders it unconditionally.
-    sessionMode.current = false
+    selectedSession.current = undefined
     const { slotCalls, getByTestId } = mountFrame()
     expect(getByTestId('center-content')).toBeTruthy()
     expect(slotCalls.map(c => c.key)).toContain('conversation')
@@ -169,6 +172,45 @@ describe('AppFrame', () => {
     expect(slotCalls.map(c => c.key)).toContain('details')
   })
 
+  it('ignores unselected states and closes only when the Session id changes', () => {
+    const { frame, instance, rerenderFrame } = mountFrame()
+    expect(tracks(frame)).toEqual([280, 360])
+
+    selectedSession.current = 's-next' as SessionId
+    act(() => { rerenderFrame() })
+    expect(tracks(frame)).toEqual([280, 0])
+
+    act(() => { instance.actions.openDetails() })
+    selectedSession.current = 's-blank' as SessionId
+    selectedSessionBlank.current = true
+    act(() => { rerenderFrame() })
+    expect(tracks(frame)).toEqual([280, 0])
+    expect(instance.getSnapshot().details).toBe(360)
+
+    selectedSession.current = 's-next' as SessionId
+    selectedSessionBlank.current = false
+    act(() => { rerenderFrame() })
+    expect(tracks(frame)).toEqual([280, 360])
+
+    selectedSession.current = undefined
+    act(() => { rerenderFrame() })
+    expect(tracks(frame)).toEqual([280, 0])
+    selectedSession.current = 's-test' as SessionId
+    act(() => { rerenderFrame() })
+    expect(tracks(frame)).toEqual([280, 0])
+  })
+
+  it('keeps the default details width when the first Session materializes', () => {
+    selectedSession.current = undefined
+    const { frame, instance, rerenderFrame } = mountFrame()
+    expect(tracks(frame)).toEqual([280, 0])
+    expect(instance.getSnapshot().details).toBe(360)
+
+    selectedSession.current = 's-first' as SessionId
+    act(() => { rerenderFrame() })
+    expect(tracks(frame)).toEqual([280, 360])
+  })
+
   it('sidebar slot receives live concession output as owner props', () => {
     const { slotCalls } = mountFrame()
     expect(slotCalls.find(c => c.key === 'sidebar')!.props).toEqual({ collapsed: false, width: 280 })

packages/client/ui-layout/tests/layout-store.spec.ts

@@ -1,8 +1,8 @@
 // @vitest-environment jsdom
 /**
  * createLayoutStore unit account: init shape, the action write set (clamp
- * inside actions), and the persist key round-trip over jsdom localStorage.
- * Uses the test-sanctioned path: factory self-call + .create() gives the
+ * inside actions), and the absence of browser persistence. Uses the
+ * test-sanctioned path: factory self-call + .create() gives the
  * real engine instance (same create path as production).
  */
 import { beforeEach, describe, expect, it } from 'vitest'
@@ -17,9 +17,9 @@ const PERSIST_KEY = 'dsh.layout.panels'
 beforeEach(() => { localStorage.clear() })
 
 describe('createLayoutStore', () => {
-  it('initializes with sidebar open at default and details closed', () => {
+  it('initializes both panels at their default widths', () => {
     const { store } = createLayoutStore().create()
-    expect(store.getSnapshot()).toEqual({ sidebar: SIDEBAR_DEFAULT, details: 0 })
+    expect(store.getSnapshot()).toEqual({ sidebar: SIDEBAR_DEFAULT, details: DETAILS_DEFAULT })
   })
 
   it('each create() is an independent instance (factory is not a singleton)', () => {
@@ -52,6 +52,7 @@ describe('createLayoutStore', () => {
 
   it('openDetails is a no-op when already open; closeDetails zeroes', () => {
     const { store, actions } = createLayoutStore().create()
+    actions.closeDetails()
     actions.openDetails()
     expect(store.getSnapshot().details).toBe(DETAILS_DEFAULT)
     actions.setDetails(500)
@@ -61,13 +62,16 @@ describe('createLayoutStore', () => {
     expect(store.getSnapshot().details).toBe(0)
   })
 
-  it('persists under dsh.layout.panels and rehydrates on the next create', () => {
+  it('does not persist panel geometry', () => {
     const first = createLayoutStore().create()
-    first.actions.setSidebar(320)
-    first.actions.openDetails()
-    expect(JSON.parse(localStorage.getItem(PERSIST_KEY) ?? '{}')).toEqual({ sidebar: 320, details: DETAILS_DEFAULT })
+    first.actions.setSidebar(400)
+    first.actions.closeDetails()
+    expect(localStorage.getItem(PERSIST_KEY)).toBeNull()
 
     const second = createLayoutStore().create()
-    expect(second.store.getSnapshot()).toEqual({ sidebar: 320, details: DETAILS_DEFAULT })
+    expect(second.store.getSnapshot()).toEqual({
+      sidebar: SIDEBAR_DEFAULT,
+      details: DETAILS_DEFAULT,
+    })
   })
 })

scripts/install-lefthook.mjs

@@ -2,7 +2,7 @@
 import { randomUUID } from 'node:crypto'
 import { existsSync, lstatSync, mkdirSync, readdirSync, readFileSync, unlinkSync, writeFileSync } from 'node:fs'
 import { spawnSync } from 'node:child_process'
-import { isAbsolute, join, resolve } from 'node:path'
+import { dirname, isAbsolute, join, resolve } from 'node:path'
 
 const MINIMUM_GIT = [2, 26, 0]
 const HOOKS_DIRECTORY = 'dsh-hooks'
@@ -437,6 +437,15 @@ function inspectOwnedHooksDirectory(hooksPath) {
   return { markerPath, ...marker }
 }
 
+function isRegisteredOwnedHooksPath(commonDirectory, hooksPath) {
+  const normalizedHooksPath = normalizedPath(hooksPath)
+  const isRegistered = registeredWorktreeConfigPaths(commonDirectory).some(
+    configPath => normalizedPath(join(dirname(configPath), HOOKS_DIRECTORY)) === normalizedHooksPath,
+  )
+  if (!isRegistered) return false
+  return inspectOwnedHooksDirectory(hooksPath)?.hooksPath === hooksPath
+}
+
 function ensureOwnedHooksDirectory(hooksPath) {
   const inspected = inspectOwnedHooksDirectory(hooksPath)
   if (inspected !== undefined) return inspected
@@ -561,14 +570,22 @@ async function main() {
       'worktree core.hooksPath',
     )
     let ownedHooksDirectory
+    let copiedWorktreePathIsOwned = false
     if (worktreePath !== undefined && worktreePath !== hooksPath) {
       ownedHooksDirectory = inspectOwnedHooksDirectory(hooksPath)
-      if (ownedHooksDirectory === undefined || ownedHooksDirectory.hooksPath !== worktreePath) {
+      const worktreePathIsRelocated = ownedHooksDirectory?.hooksPath === worktreePath
+      copiedWorktreePathIsOwned = !worktreePathIsRelocated
+        && isRegisteredOwnedHooksPath(commonDirectory, worktreePath)
+      if (!worktreePathIsRelocated && !copiedWorktreePathIsOwned) {
         refuseScopedHooksPath({ origin: `file:${worktreeConfigPath}`, scope: 'worktree', value: worktreePath })
       }
     }
     const directWorktreePathIsOwned = worktreePath !== undefined
-      && (worktreePath === hooksPath || ownedHooksDirectory?.hooksPath === worktreePath)
+      && (
+        worktreePath === hooksPath
+        || ownedHooksDirectory?.hooksPath === worktreePath
+        || copiedWorktreePathIsOwned
+      )
     const effectiveEntry = effectiveConfigEntry(root, 'core.hooksPath')
     if (effectiveEntry !== undefined) {
       const effectivePathIsOwned = effectiveEntry.scope === 'worktree'
@@ -593,6 +610,7 @@ async function main() {
       worktreePath !== undefined
       && worktreePath !== hooksPath
       && ownedHooksDirectory.hooksPath !== worktreePath
+      && !copiedWorktreePathIsOwned
     ) {
       throw new Error(`hooks directory ownership changed while relocating ${JSON.stringify(worktreePath)}`)
     }

scripts/install-lefthook.spec.ts

@@ -262,6 +262,30 @@ describe('worktree-local Lefthook installer', () => {
     expect(readFileSync(legacyHook, 'utf8')).toBe('#!/bin/sh\n# legacy hook\n')
   })
 
+  it('replaces the owned hook path Git copies into a newly added worktree', async () => {
+    const fixture = createFixture()
+    const mainInstall = await runInstaller(fixture, fixture.main)
+    expect(mainInstall.status, mainInstall.stderr).toBe(0)
+    const mainHooks = hooksPath(fixture, fixture.main)
+    const mainHookBefore = readFileSync(join(mainHooks, 'pre-commit'), 'utf8')
+    const lateLinked = join(fixture.container, 'late-linked')
+    git(fixture, fixture.main, ['worktree', 'add', '-b', 'late-linked', lateLinked])
+    write(join(lateLinked, 'lefthook.yml'), 'late-linked-worktree-config\n')
+    installFakeLefthook(lateLinked)
+    expect(git(fixture, lateLinked, ['config', '--worktree', '--get', 'core.hooksPath'])).toBe(mainHooks)
+
+    const linkedInstall = await runInstaller(fixture, lateLinked)
+
+    expect(linkedInstall.status, linkedInstall.stderr).toBe(0)
+    const linkedHooks = hooksPath(fixture, lateLinked)
+    expect(linkedHooks).not.toBe(mainHooks)
+    expect(git(fixture, lateLinked, ['config', '--worktree', '--get', 'core.hooksPath'])).toBe(linkedHooks)
+    expect(readFileSync(join(linkedHooks, 'pre-commit'), 'utf8')).toContain(
+      '# config=late-linked-worktree-config',
+    )
+    expect(readFileSync(join(mainHooks, 'pre-commit'), 'utf8')).toBe(mainHookBefore)
+  })
+
   it('serializes concurrent installs and keeps repeated output stable', async () => {
     const fixture = createFixture()
     const delayed = { DSH_TEST_LEFTHOOK_DELAY_MS: '150' }
@@ -509,6 +533,30 @@ describe('worktree-local Lefthook installer', () => {
     expect(git(fixture, fixture.linked, ['config', '--worktree', '--get', 'core.hooksPath'])).toBe('linked-custom-hooks')
   })
 
+  it('does not trust an ownership marker outside a registered worktree hook path', async () => {
+    const fixture = createFixture()
+    const mainInstall = await runInstaller(fixture, fixture.main)
+    expect(mainInstall.status, mainInstall.stderr).toBe(0)
+    const externalHooks = join(fixture.container, 'external-owned-hooks')
+    write(
+      join(externalHooks, '.dsh-lefthook-owned'),
+      `${JSON.stringify({
+        version: 1,
+        owner: 'deepseek-harness worktree-local lefthook hooks',
+        hooksPath: externalHooks,
+      })}\n`,
+      0o600,
+    )
+    git(fixture, fixture.linked, ['config', '--worktree', 'core.hooksPath', externalHooks])
+
+    const result = await runInstaller(fixture, fixture.linked)
+
+    expect(result.status).toBe(1)
+    expect(result.stderr).toContain('worktree-scoped core.hooksPath')
+    expect(git(fixture, fixture.linked, ['config', '--worktree', '--get', 'core.hooksPath'])).toBe(externalHooks)
+    expect(existsSync(hooksPath(fixture, fixture.linked))).toBe(false)
+  })
+
   it('refuses to activate a sibling worktree dormant hook path', async () => {
     const fixture = createFixture()
     const linkedConfig = join(gitDirectory(fixture, fixture.linked), 'config.worktree')

tsconfig.host.json

@@ -15,6 +15,7 @@
     "apps/web/tests/steering.e2e.ts",
     "apps/web/tests/navigation-panes.e2e.ts",
     "apps/web/tests/lifecycle-chrome.e2e.ts",
+    "apps/web/tests/details-session-lifecycle.e2e.ts",
     "apps/web/tests/settings-chrome.e2e.ts",
     "apps/web/tests/workspace-management.e2e.ts",
     "apps/web/tests/replay-round-trip.e2e.ts",