diff --git a/BLOCKED.md b/BLOCKED.md
index d522605b..18c72d84 100644
--- a/BLOCKED.md
+++ b/BLOCKED.md
@@ -1,5 +1,12 @@
 # BLOCKED
 
+## 侧栏导航循环：本机构建与登录态验收缺口（2026-09-19）
+
+- 同 SHA 基线 webpack 构建完成编译/TypeScript，但 collect page data 因 Skill runtime `symlink EPERM` 失败；修复版同环境结果见进度记录。未得到完整生产构建，因此 `/` Static 和首屏 gzip ±2% 尚未验收，不能用不完整产物代替。
+- 基线全量前端测试 3481 tests / 3403 pass / 78 fail；包含 Windows 路径、符号链接、数据库/Docker 与既有合同失败。修复版逐项对照见 [本轮记录](docs/tasks/PROGRESS-sidebar-navigation-loop-20260919.md)，不顺带放宽断言。
+- 没有受控登录态浏览器，未执行完整 Next Link 三入口点击、移动/折叠及可见分页 observer 走查。替代证据为真实 React provider/effect/transition 回归，**不等价于浏览器验收**。按 [真人清单](docs/testing/sidebar-navigation-loop-20260919.md) 补齐。
+- 发布前预检远端 verified，但碎片扫描两条既有断言失败；不以同步成功声称预检全绿。修复交付与部署状态在进度记录分别标注。
+
 ## ~~TypeSafe Jev 意图分类：等 API key（2026-09-19）~~
 
 - ~~T2/T3 阻塞，替代证据 = T0/T1 产出。~~
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d6ceb86e..9d4f79ce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # 印度占星 Skill 更新日志
 
+## 2026-09-19 — 修复侧栏导航被首页重复更新阻塞
+
+拆开首页与共享侧栏的状态订阅，消除反复更新导致「星盘 / 星历 / 我的报告」点了不切页的反馈循环；仍使用客户端导航，不以整页刷新绕过。新增真实 React 生命周期与切页回归，保留最新会话操作和离开首页后的只读侧栏。测试站部署及登录态走查状态见本轮进度记录。Skill 版本不变。
+
 ## 2026-09-19 — 设置弹窗布局与资料入口整理
 
 设置弹窗的四个分区继续共用固定外框，桌面导航加宽并与内容区分隔，右侧内容增加稳定内边距，表单阅读宽度更舒适；导航去掉会误导成页面跳转的右箭头。个人资料的账户头像预览放大到 56px，星盘资料的“添加其他人”移到分组标题旁，列表较长时也容易找到。Skill 版本不变（纯界面改动）。
diff --git a/docs/BUG_HISTORY.md b/docs/BUG_HISTORY.md
index fdc2d27f..a57ad855 100644
--- a/docs/BUG_HISTORY.md
+++ b/docs/BUG_HISTORY.md
@@ -12797,3 +12797,20 @@
 - 相关记录：BUG-554、BUG-698
 - 复发自：无
 - 修复版本：待发布
+
+## BUG-971 | 首页侧栏注册反馈循环阻塞客户端导航
+
+- 状态：investigating（代码与定向回归完成；部署和登录态真人闭环待核对）
+- 首次发现：2026-09-19
+- 最近更新：2026-09-19
+- 影响面：首页侧栏「星盘 / 星历 / 我的报告」客户端导航与共享外壳更新。
+- 用户现象：测试站刷新后仍点了不切页，Network 出现 `/api/ephemeris`；该请求来自 pointerenter/pointerdown 数据预取，不代表 Next 导航成功。
+- 触发条件：登录态 Home hydrated 后注册侧栏操作；useSessionManagement 每次 render 产生新的 visibleSessions/操作函数，注册 effect 随之再次发布。
+- 根因：SessionListContext 同时承载业务数据和 registration。Home 写 registration 又订阅同一 value，setRegistration 广播反向使 Home 重渲染，形成默认优先级更新循环，阻塞 Next Link 使用的 startTransition。旧共享外壳测试只有源码正则，不能执行 effect，未拦住运行时反馈。
+- 修复：会话数据 context 保留稳定 registrar，registration 独立只读 context 仅供 AppShell 订阅；映射显式接收 registration，children 原样透传。保留注册 effect 完整依赖、最新回调及卸载注销，不冻结首次闭包、不改成整页刷新。
+- 验证：真实 React 最小原版实验 122 render / 118 注册 / 2 maximum-depth 告警（保护阈值主动终止）；稳定数组和回调的因果对照为 3/1/0。另一次 transition 实验直到主动停止反馈后目的地才 commit。正式新生命周期测试旧实现 3 fail / 1 pass、修复 4/4 pass；含普通/StrictMode 空闲收敛、transition 注销重入、最新业务数据与回调、401。实际 SidebarProvider/Inset 包裹，但不模拟浏览器点击/布局；完整主会话复验、基线失败对照与发布结果见进度记录。
+- 防复发：Home 不订阅自己生产的 shell registration，外壳不重建 children；保留真实客户端 React 回归而非仅 SSR/源码正则。未稳定数组/函数的测试输入不得改成固定常量来掩盖回归。
+- 相关记录：BUG-927（共享外壳）、BUG-965 / BUG-967（同名导航现象但不同跨部署机制）；本轮不扩修 health 快照时序漏洞。
+- 复发自：BUG-927 共享外壳订阅边界的新增运行时回归，非已证实的旧构建不匹配复发。
+- 修复版本：本轮 `fix(frontend): isolate sidebar registration to unblock navigation` 提交；发布状态见 `docs/tasks/PROGRESS-sidebar-navigation-loop-20260919.md`。
+- 验收缺口：Windows Skill runtime symlink EPERM 阻止完整基线构建；Static/gzip 与真实登录态浏览器检查不得标通过。见 `BLOCKED.md` 和 `docs/testing/sidebar-navigation-loop-20260919.md`。
diff --git a/docs/tasks/PROGRESS-sidebar-navigation-loop-20260919.md b/docs/tasks/PROGRESS-sidebar-navigation-loop-20260919.md
new file mode 100644
index 00000000..196254e0
--- /dev/null
+++ b/docs/tasks/PROGRESS-sidebar-navigation-loop-20260919.md
@@ -0,0 +1,57 @@
+# 执行与验收 · 侧栏导航注册循环（2026-09-19）
+
+## 授权、基线与范围
+
+- 产品明确授权修复并 push staging，实施计划已批准；主代理负责诊断/验收/交付，子代理实施限定源码与测试。
+- 基线 `origin/staging = 507ef959f519218d190574fa588fc7b92c60229b`；独立工作树 `.worktrees/sidebar-navigation-loop-20260919`，分支 `codex/sidebar-navigation-loop-20260919`。同 SHA 的 detached 基线工作树用于测试和构建比较，不改主检出、不 stash。
+- 开工核对 Bug 最大号 970，本轮暂用 BUG-971，提交前再次检查编号冲突。
+- 只拆分会话数据与侧栏注册订阅；保持单侧栏、单列表数据源、最新操作回调、卸载注销、inert 和客户端导航。无样式/文案、数据库、依赖、workflow、DNS、main 改动。不扩修 BUG-967 的 health 时序问题。
+
+## 事故实证与根因
+
+产品确认测试站三个入口刷新后仍不切页；看到的 `/api/ephemeris` 是 `AppSidebar` 的 pointerenter/pointerdown 数据预取，不代表导航成功。匿名三个页面和 RSC 均 200；线上 `d6fc4fb8` 与本轮基线的关键导航源码相同。
+
+`Home -> useSessionList -> useSessionManagement(新 visibleSessions/回调) -> useHomeShellRegistration effect -> setRegistration -> 同一 context 通知 Home` 形成反馈。真实 React 最小运行原版 122 render / 118 注册 / 2 个 maximum-depth 告警（保护阈值主动终止）；只稳定回调无效，数组与回调稳定对照 3/1/0。另在第 3 render 发 startTransition，循环直到第 301 render 主动停止才允许目标 commit；普通优先级与稳定数组对照均可正常提交。Next Link 实际通过 startTransition 导航。
+
+这是新的共享外壳运行时缺陷，关联 BUG-927，不把本轮刷新无效强归为旧 BUG-965/967。旧 provider 测试只有源码正则，未执行 effects。
+
+## 实施进度
+
+- [x] 隔离基线与实施工作树、复用现有依赖（junction，不安装或升级）。
+- [x] 注册订阅读写隔离与外壳消费调整（3 个源码文件，Home 状态与原注册 effect 未改）。
+- [x] 真实 React 生命周期/transition 回归及反向验证。
+- [x] 独立审查及可运行验收、完整测试/构建基线比较；Static/gzip/真人浏览器仍为明确缺口。
+- [ ] 提交与快进 push staging、远端 SHA/部署核对。
+
+独立审查确认 data value 不依赖 registration、registrar 保持稳定、shell 单独读取、children 原样透传；账户/session 真正变动仍能通知 Home 并发布最新闭包。新 host helper 只运行 React reconciler/effect，不模拟点击、几何或浏览器可访问性。可见分页 observer、SidebarTrigger 操作与完整 Next 浏览器仍列真人缺口，没有声称全覆盖。
+
+## 验证记录
+
+| 项目 | 基线 | 修复后 | 结论 |
+| --- | --- | --- | --- |
+| 全量前端测试 | 3481 tests / 3403 pass / 78 fail | 3486 tests / 3408 pass / 78 fail | 新增 5 个通过；78 个失败测试名/次数完全一致，非全绿 |
+| TypeScript | webpack 类型检查完成 | 独立 `tsc --noEmit --incremental false` 0 错 | 通过 |
+| 完整 lint | 未重跑（未触碰原 warnings） | 0 error / 120 warnings，exit 0 | 零 error 通过，未顺手修 warning |
+| 生产构建 / 首页 Static / 首屏 gzip | 编译/类型完成，collect page data: Skill symlink EPERM | 同阶段同根因 EPERM（含共同 /api/birth-time-guide） | 构建失败；Static/gzip 未验收 |
+| 生命周期反向 | 新 4 条在旧源码 3 fail / 1 pass（50 render 保护） | 4/4 pass | 证明能抓回归 |
+| 主会话独立五文件定向 | 原四文件 60/60 | 65/65，fail 0 | 通过 |
+| staging 部署 | 诊断时 d6fc4fb8 | 未推送 | 未验收 |
+
+- 全量逐项证据：[78 项失败对照](../testing/sidebar-navigation-baseline-failures-20260919.md)。全量与构建使用同一 node_modules、相同命令；不读取用户凭据，不改生产源码绕过 Windows 权限。
+- 定向：`tsx --test tests/session-list-lifecycle.test.tsx tests/session-list-provider.test.ts tests/secondary-page-entry.test.ts tests/sidebar-contract.test.ts tests/account-dialog-inert-20260918.test.ts`。
+- 构建：`npm run build -- --webpack`。Next 16.3.1 编译与类型通过不等于构建通过。
+- 推送前 fetch 得到 `a2bcdee006397e2417f2e42d30ca030dd41ec480`，相对初始基线仅 2 个文档提交、2 处文档文件变化，Bug 最大号仍 970；整合后代码测试基线不变。
+- Gitea Actions runs 匿名只读 API 返回 401；未借用/搜寻其他账号凭据，门禁详情查询为环境缺口。
+
+## 既有断言改动
+
+| 原值 | 新值 | 原因 |
+| --- | --- | --- |
+| 既有断言全部保留 | 不修改任何旧断言；追加 1 条结构合同和 4 条生命周期测试 | 锁定订阅边界并执行真实 effect/transition，测试总数 +5；没有弱化或减少覆盖 |
+
+## 环境边界
+
+- 不使用真实用户 Cookie/凭据，不接管故障标签页；登录态完整 Next 点击验收待 `docs/testing/sidebar-navigation-loop-20260919.md`。
+- Windows 基线与修复树均复用相同 node_modules；为避免 Turbopack 外部 junction 限制，用相同 `npm run build -- --webpack` 对照，具体结果如实记录。
+- 本会话此前 `pre_work_check.py` 远端 verified，但两条碎片扫描断言失败（镜像路径字面量与候选/残留统计边界），不属于本轮前端修复，不改断言掩盖失败。
+- Skill 版本不变。
diff --git a/docs/tasks/README.md b/docs/tasks/README.md
index f805017a..f56c3a33 100644
--- a/docs/tasks/README.md
+++ b/docs/tasks/README.md
@@ -7,6 +7,8 @@
 - 被环境或依赖挡住的事项写进根目录 `BLOCKED.md`；Bug 事实写进 `docs/BUG_HISTORY.md`；两者不在这里重复。
 - 纯文档改动不触发 staging 门禁（见 `deploy/gated-paths.txt`）。
 
+- [侧栏导航注册循环修复与验收](PROGRESS-sidebar-navigation-loop-20260919.md) — 2026-09-19，修复/回归已完成，完整验收与 staging 交付状态见记录。
+
 ## 状态板
 
 这一节是所有任务的总板。任务书推上来时加一行，状态变化时改这一行，不另开文件。
diff --git a/docs/testing/sidebar-navigation-baseline-failures-20260919.md b/docs/testing/sidebar-navigation-baseline-failures-20260919.md
new file mode 100644
index 00000000..6efa958f
--- /dev/null
+++ b/docs/testing/sidebar-navigation-baseline-failures-20260919.md
@@ -0,0 +1,84 @@
+# 侧栏修复 · 同环境全量失败逐项对照
+
+基线 `507ef959`：3481 tests / 3403 pass / 78 fail。修复：3486 tests / 3408 pass / 78 fail。按测试名及出现次数比较，新增/消失失败均为 0；下列 78 项在两边均失败，不作为通过。未收录原始输出或任何凭据。
+
+| 测试名 | 基线 | 修复 |
+| --- | --- | --- |
+| `admin code functions reject immutable codes, revoked redemption, and roll back on audit failure` | fail | fail |
+| `operation-level admin email reauthentication is removed from routes and UI` | fail | fail |
+| `rectification agent maps setup failures without calling the rest of the handler` | fail | fail |
+| `renders the persisted Beam avatar in the sidebar, account menu, and profile editor` | fail | fail |
+| `public code never imports the internal dynamic choice contract` | fail | fail |
+| `tests\\birth-time-guide-agent.test.ts` | fail | fail |
+| `candidate scores stay out of the specified client ownership boundary` | fail | fail |
+| `personal Agent exposes the Jyotish Skill and named server tool` | fail | fail |
+| `general agent runtime has no Jyotish skill package and no personal chart tool` | fail | fail |
+| `the route's own strict checklist reaches the answer, not just the package listing` | fail | fail |
+| `a route the skill declares no checklist for is reported, not filled in with another route's` | fail | fail |
+| `health uses the skill's health-timing-strict checklist` | fail | fail |
+| `wealth uses finance-timing-strict as the live checklist, with the wealth alias in the heading` | fail | fail |
+| `a multi-domain plan carries every executed route's checklist once` | fail | fail |
+| `no plan can spend the answer's context on method` | fail | fail |
+| `the widest legal plan still fits the budget` | fail | fail |
+| `further reading offers the references the skill names, and only ones that exist` | fail | fail |
+| `the delivered method is quoted from the live skill tree` | fail | fail |
+| `tests\\consultation-workflow-request.test.ts` | fail | fail |
+| `admin customer reset clears only rebuildable application state` | fail | fail |
+| `service and restricted admin database identities stay separated` | fail | fail |
+| `Owner recovery grants only one currently loginable synced identity admin` | fail | fail |
+| `staging backups are encrypted, atomic, private, and retain the newest three` | fail | fail |
+| `rejects destructive backup directory aliases and symlink components before mutation` | fail | fail |
+| `rejects unsafe writable backup parents before creating the target` | fail | fail |
+| `rejects a direct canonical sticky shared backup directory before chmod` | fail | fail |
+| `creates every absent backup path component privately despite a permissive caller umask` | fail | fail |
+| `same-second backups publish once without overwriting the completed archive` | fail | fail |
+| `find enumeration failures preserve existing backups and do not report completion` | fail | fail |
+| `refuses full disks and removes a failed-pipeline partial file` | fail | fail |
+| `billing order adjustments and redemption reasons are atomic and audited` | fail | fail |
+| `billing, subscriptions, usage authorization, RBAC, and model publication remain transactional` | fail | fail |
+| `saving a published product forks a draft and delete retires or removes it` | fail | fail |
+| `append_consultation_question ignores thinking fields and enforces the physical JSON cap` | fail | fail |
+| `database env validator accepts punctuated literal required secrets` | fail | fail |
+| `database env validator rejects symlinks and unsafe modes` | fail | fail |
+| `database env validator enforces an explicit staging owner uid without printing values` | fail | fail |
+| `database env validator accepts a private valid file without printing values` | fail | fail |
+| `local PostgreSQL applies the reviewed business schema and serves authenticated business calls` | fail | fail |
+| `personal_reports.card_summary is nullable, owner-read, service-written, and length-capped` | fail | fail |
+| `personal report job migration is atomic, lease-bound, recoverable, and owner read-only` | fail | fail |
+| `longform appendices are owner-read, service-written, and never change report status` | fail | fail |
+| `personal report sections enforce owner-read RLS and service-owned durable transitions` | fail | fail |
+| `block_scan RPCs are service_role-only and advance a declared period` | fail | fail |
+| `redeem security: case-sensitive hashing, rate limiting, idempotency and order ownership` | fail | fail |
+| `read_report_candidate_range is service_role-only, returns only the window, and stays empty without rows` | fail | fail |
+| `self-hosted identity migration creates Better Auth tables with least privilege` | fail | fail |
+| `every color token used as a Tailwind utility is exposed through @theme` | fail | fail |
+| `staging model provider env preparation removes legacy settings and keeps one stable key` | fail | fail |
+| `staging env validator rejects selector drift, duplicates, and unsafe permissions` | fail | fail |
+| `production env validators accept only self-hosted production selectors and role URLs` | fail | fail |
+| `Better Auth supports shared user OTP/password sessions for admins` | fail | fail |
+| `job migration mirror is exact and preserves personal_reports as the document projection` | fail | fail |
+| `document v2 and durable job migrations are exact db/supabase mirrors` | fail | fail |
+| `document v2 migration preserves v1 reads and adds explicit product depth` | fail | fail |
+| `durable job migration defines the complete state, lease, retry, and identity contract` | fail | fail |
+| `durable job migration atomically enqueues reports and exposes lease RPCs only to service_role` | fail | fail |
+| `ingest P0: education kinds, batch confirm, opening focus reuse, precision lock` | fail | fail |
+| `PR-4 candidate decisions use server UUIDs, receipt-derived gates and separate acceptance/confirmation` | fail | fail |
+| `tests\\rectification-v9-agent.test.ts` | fail | fail |
+| `v9 migration applies on a fresh database and re-applies idempotently` | fail | fail |
+| `v9 open is atomic, idempotent and allows separate homepage cases` | fail | fail |
+| `v9 enforces profile gating, ownership and terminal read-only` | fail | fail |
+| `v9 evidence lifecycle: quote grounding, idempotency, confirm and revision lineage` | fail | fail |
+| `v9 legacy backfill maps statuses, keeps one resumable per user and is idempotent` | fail | fail |
+| `v9 agent api migration applies, seeds the runtime flag and guards consent` | fail | fail |
+| `v9 ignores a historical active minute and allows reselection within the live result` | fail | fail |
+| `tests\\skill-binding.test.ts` | fail | fail |
+| `immutable Skill migration enforces RPC-only identity, legacy adoption, and cascade-safe receipts` | fail | fail |
+| `checked-in registry verifies hashed product packages and leaves consult on the live skill` | fail | fail |
+| `path traversal and symlink escape fail closed` | fail | fail |
+| `symbolic links are rejected even when their target stays inside the project root` | fail | fail |
+| `live consult skill reads a hand-updated tree without a registry hash` | fail | fail |
+| `changed staging workflows are syntactically valid YAML` | fail | fail |
+| `live staging sync preserves env, state, incoming files, and encrypted backups` | fail | fail |
+| `live staging sync repairs nested deploy-tree drift without preserving foreign ownership` | fail | fail |
+| `first immutable deployment rolls back to validated local image IDs` | fail | fail |
+| `is-docs-only-range.sh decides from local history and refuses non-ancestor ranges` | fail | fail |
diff --git a/docs/testing/sidebar-navigation-loop-20260919.md b/docs/testing/sidebar-navigation-loop-20260919.md
new file mode 100644
index 00000000..99727b6b
--- /dev/null
+++ b/docs/testing/sidebar-navigation-loop-20260919.md
@@ -0,0 +1,25 @@
+# 侧栏导航循环 · 测试站真人验收（2026-09-19）
+
+关联 BUG-971；自动化/交付结果见 [进度记录](../tasks/PROGRESS-sidebar-navigation-loop-20260919.md)。以下项目尚未真人验收，不以匿名 HTTP 200 或最小 React host 测试替代。
+
+## 前置
+
+- 仅测试站 `https://staging.jyotisha.chat`；先核对 `/api/health` 的 `deployment.gitCommit` 为本轮代码提交。
+- 使用本人受控测试账号，不转交 Cookie、JWT、出生资料、会话内容或完整 HAR/curl；曾外发的会话凭据先退出登录并重新登录。
+- 开 Console 与 Network，清空已有记录。截图只保留脱敏错误、请求路径/状态码、部署 SHA。
+
+## 核心复现与回归
+
+1. 刷新首页，静置后点击「星盘」；地址应变 `/chart`，正文与高亮同时切换。回首页后分别点「星历」「我的报告」，验证 `/ephemeris`、`/reports`。
+2. 三个次级页互跳、浏览器前进/后退、回首页再点三入口，不能停在旧页或必须二次点击。
+3. Console 不应持续刷 `Maximum update depth exceeded`；静置时 Network 不应持续发送同类请求。
+4. `/api/ephemeris` 可能在指针进入/按下时预取，**不代表导航完成**。以 URL、目的页正文和路由响应共同判断；按需记录 `_rsc` 请求状态，不记录敏感查询参数。
+5. 切换受控测试会话、创建空会话、改名/置顶/归档/删除测试会话，确认高亮、列表和操作结果仍同步，不出现旧回调操作错误对象。不要操作真实重要内容。
+6. 有下一页会话时将列表滚至底部，验证分页可见、加载一次后稳定，没有 observer 重挂导致请求风暴；来回切页不重新拉全列表。
+7. 打开并关闭账户菜单及设置弹窗，验证正文 inert/恢复、Escape 和导航恢复正常；次级页侧栏保持只读且返回首页后恢复操作。
+8. 桌面展开/折叠侧栏、移动端抽屉各试三入口；点击后抽屉关闭、正文切换。若登录失效，应正常到登录页/只读回退，不持续刷新。
+
+## 回报格式
+
+- 部署 SHA、浏览器/视口、通过/失败的步骤编号。
+- 失败时仅提供脱敏 Console 错误和请求路径/状态码、URL 是否变化；不贴凭据或原始用户内容。
diff --git a/frontend/DESIGN.md b/frontend/DESIGN.md
index ad81b0df..3a0caaf2 100644
--- a/frontend/DESIGN.md
+++ b/frontend/DESIGN.md
@@ -410,6 +410,12 @@ one skeleton, none of them carrying the sidebar.
   `NEXT_PUBLIC_GIT_COMMIT` with `/api/health` `.deployment.gitCommit` on
   visibility and before navigation; a mismatch uses `window.location.assign`,
   a match keeps the client router.
+- **Separate data and shell subscriptions.** `SessionListProvider` owns both,
+  but Home reads only the session/account context and its stable registrar.
+  Only AppShell subscribes to shell registration; it passes the original
+  `children` through unchanged. Registering fresh controls/rows must not render
+  their producer again: that feedback loop can starve client navigation.
+  Business changes still publish current callbacks; Home unmount clears them.
 - **One sidebar component, two modes.** `AppSidebar` is the only sidebar in the
   product. `/` passes `controls`; the secondary layout does not, and without it
   the same markup renders read-only. There used to be a second component for
diff --git a/frontend/src/app/(app)/layout.tsx b/frontend/src/app/(app)/layout.tsx
index c9997360..3a7b9159 100644
--- a/frontend/src/app/(app)/layout.tsx
+++ b/frontend/src/app/(app)/layout.tsx
@@ -4,13 +4,13 @@ import type { ReactNode } from "react";
 
 import { AppSidebar } from "@/components/app-sidebar";
 import { SidebarInset, SidebarProvider } from "@/components/ui/sidebar";
-import { SessionListProvider, sessionListSidebarModel, useSessionList } from "@/hooks/use-session-list";
+import { SessionListProvider, sessionListSidebarModel, useSessionList, useShellRegistration } from "@/hooks/use-session-list";
 import "../site-styles";
 
 function AppShell({ children }: { children: ReactNode }) {
   const list = useSessionList();
-  const { sessions, account } = sessionListSidebarModel(list);
-  const registration = list.registration;
+  const registration = useShellRegistration();
+  const { sessions, account } = sessionListSidebarModel(list, registration);
 
   return (
     <SidebarProvider escapeBlocked={registration?.escapeBlocked ?? false}>
diff --git a/frontend/src/hooks/use-session-list.ts b/frontend/src/hooks/use-session-list.ts
index 9ac76a31..810802f7 100644
--- a/frontend/src/hooks/use-session-list.ts
+++ b/frontend/src/hooks/use-session-list.ts
@@ -1 +1 @@
-export { SessionListProvider, useSessionList, sessionListSidebarModel } from "@/lib/session-list-context";
+export { SessionListProvider, useSessionList, useShellRegistration, sessionListSidebarModel } from "@/lib/session-list-context";
diff --git a/frontend/src/lib/session-list-context.tsx b/frontend/src/lib/session-list-context.tsx
index cab218d0..5af0e32b 100644
--- a/frontend/src/lib/session-list-context.tsx
+++ b/frontend/src/lib/session-list-context.tsx
@@ -55,10 +55,13 @@ export type SessionListContextValue = {
   ready: Promise<void>;
   boot: () => SessionListBoot | null;
   registerShellControls: (registration: ShellRegistration | null) => void;
-  registration: ShellRegistration | null;
 };
 
 const SessionListContext = createContext<SessionListContextValue | null>(null);
+// Home produces these controls; only the shell subscribes to their updates.
+// Publishing them through the data context re-renders Home, whose registration
+// effect has fresh callbacks/rows, feeding another update back to the provider.
+const ShellRegistrationContext = createContext<ShellRegistration | null>(null);
 
 function createReadyGate(): { promise: Promise<void>; resolve: () => void } {
   let settle = () => {};
@@ -167,20 +170,24 @@ export function SessionListProvider({ children }: { children: ReactNode }) {
     ready: readyPack.promise,
     boot,
     registerShellControls,
-    registration,
   }), [
     account,
     boot,
     readyPack.promise,
     registerShellControls,
-    registration,
     sessions,
     sessionsCursor,
     settled,
     signedOut,
   ]);
 
-  return <SessionListContext.Provider value={value}>{children}</SessionListContext.Provider>;
+  return (
+    <SessionListContext.Provider value={value}>
+      <ShellRegistrationContext.Provider value={registration}>
+        {children}
+      </ShellRegistrationContext.Provider>
+    </SessionListContext.Provider>
+  );
 }
 
 export function useSessionList(): SessionListContextValue {
@@ -191,11 +198,17 @@ export function useSessionList(): SessionListContextValue {
   return value;
 }
 
-export function sessionListSidebarModel(list: SessionListContextValue): {
+export function useShellRegistration(): ShellRegistration | null {
+  return useContext(ShellRegistrationContext);
+}
+
+export function sessionListSidebarModel(
+  list: SessionListContextValue,
+  registered: ShellRegistration | null,
+): {
   sessions: readonly SidebarSession[];
   account: SidebarAccount | null;
 } {
-  const registered = list.registration;
   return {
     sessions: registered?.sidebarSessions ?? sessionsToSidebarRows(list.sessions),
     account: registered?.sidebarAccount ?? toSidebarAccount(list.account),
diff --git a/frontend/tests/react-client-lifecycle-test-support.ts b/frontend/tests/react-client-lifecycle-test-support.ts
new file mode 100644
index 00000000..05c73a91
--- /dev/null
+++ b/frontend/tests/react-client-lifecycle-test-support.ts
@@ -0,0 +1,96 @@
+import { act, type ReactNode } from "react";
+import { createRoot } from "react-dom/client";
+
+/** Minimal host DOM for React lifecycle tests, not a browser/layout simulator.
+ * Components may render div/section wrappers; no event dispatch, geometry or
+ * accessibility behavior is emulated. React's reconciler/effects are real.
+ */
+class HostElement {
+  readonly nodeType = 1;
+  readonly namespaceURI = "http://www.w3.org/1999/xhtml";
+  readonly childNodes: HostElement[] = [];
+  readonly style = {};
+  readonly attributes = new Map<string, string>();
+  parentNode: HostElement | null = null;
+  textContent = "";
+  constructor(readonly tagName: string, readonly ownerDocument: HostDocument) {}
+  get nodeName() { return this.tagName; }
+  get firstChild() { return this.childNodes[0] ?? null; }
+  addEventListener() {}
+  removeEventListener() {}
+  setAttribute(name: string, value: string) { this.attributes.set(name, String(value)); }
+  removeAttribute(name: string) { this.attributes.delete(name); }
+  appendChild(node: HostElement) {
+    this.childNodes.push(node);
+    node.parentNode = this;
+    return node;
+  }
+  insertBefore(node: HostElement, before: HostElement) {
+    this.childNodes.splice(this.childNodes.indexOf(before), 0, node);
+    node.parentNode = this;
+    return node;
+  }
+  removeChild(node: HostElement) {
+    this.childNodes.splice(this.childNodes.indexOf(node), 1);
+    node.parentNode = null;
+    return node;
+  }
+}
+
+class HostDocument {
+  readonly nodeType = 9;
+  readonly activeElement = null;
+  defaultView: unknown;
+  addEventListener() {}
+  removeEventListener() {}
+  createElement(tag: string) { return new HostElement(tag.toUpperCase(), this); }
+  createElementNS(_namespace: string, tag: string) { return this.createElement(tag); }
+}
+
+export function createClientLifecycleHarness() {
+  const document = new HostDocument();
+  const frames = new Map<number, ReturnType<typeof setTimeout>>();
+  let frameId = 0;
+  const window = {
+    document,
+    innerWidth: 1440,
+    HTMLElement: HostElement,
+    HTMLIFrameElement: class {},
+    addEventListener() {},
+    removeEventListener() {},
+    requestAnimationFrame(callback: () => void) {
+      const id = ++frameId;
+      frames.set(id, setTimeout(() => { frames.delete(id); callback(); }, 0));
+      return id;
+    },
+    cancelAnimationFrame(id: number) { clearTimeout(frames.get(id)); frames.delete(id); },
+  };
+  document.defaultView = window;
+  const globals = { window, document, IS_REACT_ACT_ENVIRONMENT: true };
+  const originals = Object.fromEntries(Object.keys(globals).map((key) => [
+    key, Object.getOwnPropertyDescriptor(globalThis, key),
+  ]));
+  for (const [key, value] of Object.entries(globals)) {
+    Object.defineProperty(globalThis, key, { value, writable: true, configurable: true });
+  }
+  const errors: unknown[] = [];
+  const root = createRoot(document.createElement("div") as unknown as HTMLElement, {
+    onUncaughtError: (error) => { errors.push(error); },
+  });
+  return {
+    errors,
+    async render(node: ReactNode) { await act(async () => { root.render(node); }); },
+    async update(action: () => void) { await act(async () => { action(); }); },
+    async idle() { await act(async () => { await new Promise((resolve) => setTimeout(resolve, 10)); }); },
+    async close() {
+      try { await act(async () => { root.unmount(); }); }
+      finally {
+        for (const timer of frames.values()) clearTimeout(timer);
+        for (const [key, descriptor] of Object.entries(originals)) {
+          if (descriptor) Object.defineProperty(globalThis, key, descriptor);
+          else Reflect.deleteProperty(globalThis, key);
+        }
+      }
+    },
+  };
+}
diff --git a/frontend/tests/session-list-lifecycle.test.tsx b/frontend/tests/session-list-lifecycle.test.tsx
new file mode 100644
index 00000000..28d91f71
--- /dev/null
+++ b/frontend/tests/session-list-lifecycle.test.tsx
@@ -0,0 +1,186 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import { StrictMode, startTransition, useEffect, useState, type ReactNode } from "react";
+
+import { SidebarInset, SidebarProvider } from "../src/components/ui/sidebar.tsx";
+import { useHomeShellRegistration } from "../src/hooks/use-home-shell-registration.ts";
+import * as sessionList from "../src/lib/session-list-context.tsx";
+import { emptyProfile, type Account, type ChatSession } from "../src/lib/home-types.ts";
+import { createClientLifecycleHarness } from "./react-client-lifecycle-test-support.ts";
+
+const account: Account = {
+  user: { id: "11111111-1111-4111-8111-111111111111", email: null },
+  profile: { ...emptyProfile, name: "Synthetic" },
+  avatar: null, credits: 10, isAdmin: false, adminUrl: null,
+  rectificationPriceCredits: 0, activeSubscription: null,
+  hasConfirmedBirthTime: false, hasUsableBirthTime: false,
+};
+const row: ChatSession = {
+  id: "22222222-2222-4222-8222-222222222222", title: "Synthetic session", theme: "general",
+  modelId: "test", messages: [], createdAt: 1, updatedAt: 1,
+  sessionType: "consultation", rectificationCaseId: null, chartProfileId: null,
+  chartProfileName: null, chartProfileRole: null, pinned: false, archivedAt: null,
+  messagesHydrated: false,
+};
+const noop = () => {};
+const trigger = { current: null };
+const charts: never[] = [];
+
+async function fixture(options: { strict?: boolean; unauthorized?: boolean } = {}) {
+  const harness = createClientLifecycleHarness();
+  const originalFetch = globalThis.fetch;
+  const requests: string[] = [];
+  globalThis.fetch = (async (input) => {
+    const url = String(input);
+    requests.push(url);
+    assert.ok(url === "/api/account" || url.startsWith("/api/sessions?"), `unexpected fetch ${url}`);
+    return new Response(JSON.stringify(url === "/api/account" ? account : { sessions: [], nextCursor: null }), {
+      status: options.unauthorized ? 401 : 200,
+    });
+  }) as typeof fetch;
+  let homeRenders = 0;
+  let targetCommits = 0;
+  let latestList: sessionList.SessionListContextValue | undefined;
+  let latestShell: sessionList.ShellRegistration | null = null;
+  let latestModel: ReturnType<typeof sessionList.sessionListSidebarModel> | undefined;
+  let setPage: (home: boolean) => void = noop;
+  let revise: (revision: number) => void = noop;
+  const callbackRevisions: number[] = [];
+
+  function HomeProbe() {
+    const list = sessionList.useSessionList();
+    const [revision, setRevision] = useState(0);
+    // Bound failure even if the old effect/context feedback is reintroduced.
+    homeRenders += 1;
+    if (homeRenders > 50) throw new Error("Home registration failed to settle within 50 renders");
+    const changed = () => { callbackRevisions.push(revision); };
+    useHomeShellRegistration({
+      account: list.account, accountMenuOpen: revision > 0, accountTrigger: trigger,
+      activeSessionId: `revision-${revision}`, cancellationPending: false,
+      chartLibrary: charts, creatingSession: false, hydrated: list.settled,
+      loadMoreSessions: changed, modalOpen: revision > 0, modelCatalog: null,
+      openAccountDialog: changed, pendingSessionId: null,
+      profile: { ...emptyProfile, name: `Synthetic ${revision}` },
+      rectificationErrorMessage: "", rectificationErrorSessionId: null,
+      rectificationOpeningSessionId: null, rectificationSurfaceOpen: false,
+      registerShellControls: list.registerShellControls,
+      renameSession: changed, selectSession: changed, sessionMenuId: null,
+      sessions: list.sessions, sessionsCursor: null,
+      setAccountMenuOpen: noop, setPendingSessionDeletion: noop, setSessionMenuId: noop,
+      shareSession: changed, showArchivedSessions: false, startNewChat: changed,
+      toggleArchivedSession: changed, toggleArchivedView: changed, togglePinnedSession: changed,
+      // Like useSessionManagement, intentionally new array/callbacks each render.
+      visibleSessions: list.sessions.filter(() => true),
+    });
+    useEffect(() => { revise = setRevision; }, []);
+    return null;
+  }
+  function Target() {
+    useEffect(() => { targetCommits += 1; }, []);
+    return null;
+  }
+  function Shell({ children }: { children: ReactNode }) {
+    const list = sessionList.useSessionList();
+    const registration = sessionList.useShellRegistration();
+    useEffect(() => {
+      latestList = list;
+      latestShell = registration;
+      latestModel = sessionList.sessionListSidebarModel(list, registration);
+    });
+    // Exercise the actual second provider and unchanged children identity too:
+    // shell context updates must not re-render the Home registration producer.
+    return <SidebarProvider escapeBlocked={registration?.escapeBlocked ?? false}>
+      <SidebarInset inert={registration?.insetInert}>{children}</SidebarInset>
+    </SidebarProvider>;
+  }
+  function Router() {
+    const [home, showHome] = useState(true);
+    useEffect(() => { setPage = showHome; }, []);
+    return <sessionList.SessionListProvider><Shell>{home ? <HomeProbe /> : <Target />}</Shell></sessionList.SessionListProvider>;
+  }
+  try {
+    await harness.render(options.strict ? <StrictMode><Router /></StrictMode> : <Router />);
+  } catch (error) {
+    await harness.close();
+    globalThis.fetch = originalFetch;
+    throw error;
+  }
+  return {
+    harness, requests, callbackRevisions,
+    get renders() { return homeRenders; },
+    get commits() { return targetCommits; },
+    get list() { assert.ok(latestList); return latestList; },
+    get shell() { return latestShell; },
+    get model() { assert.ok(latestModel); return latestModel; },
+    async navigate(home: boolean) { await harness.update(() => startTransition(() => setPage(home))); },
+    async revise(value: number) { await harness.update(() => revise(value)); },
+    async close() { try { await harness.close(); } finally { globalThis.fetch = originalFetch; } },
+  };
+}
+
+for (const strict of [false, true]) {
+  test(`home registration settles and transitions unregister/reenter (StrictMode=${strict})`, async () => {
+    const app = await fixture({ strict });
+    try {
+      assert.deepEqual(app.harness.errors, []);
+      assert.ok(app.shell, "hydrated Home registers its controls");
+      const idleRenders = app.renders;
+      await app.harness.idle();
+      assert.equal(app.renders, idleRenders, "idle shell does not feed updates back into Home");
+      assert.ok(idleRenders < 15, `unexpected render growth: ${idleRenders}`);
+      const reads = app.requests.length;
+      await app.navigate(false);
+      assert.deepEqual(app.harness.errors, []);
+      assert.ok(app.commits > 0, "startTransition commits the destination");
+      assert.equal(app.shell, null, "Home cleanup unregisters controls");
+      assert.equal(app.model.account?.name, "Synthetic", "secondary page uses account fallback");
+      await app.navigate(true);
+      assert.ok(app.shell, "returning Home registers new controls");
+      assert.equal(app.requests.length, reads, "shared provider does not refetch on route changes");
+      await app.harness.idle();
+      assert.deepEqual(app.harness.errors, []);
+    } finally { await app.close(); }
+  });
+}
+
+test("shell receives current callbacks, account and session state without freezing closures", async () => {
+  const app = await fixture();
+  try {
+    assert.deepEqual(app.harness.errors, []);
+    const initialCallback = app.shell?.controls.onOpenProfile;
+    await app.revise(1);
+    assert.equal(app.shell?.activeSessionId, "revision-1");
+    assert.equal(app.shell?.insetInert, true);
+    assert.equal(app.shell?.escapeBlocked, true);
+    assert.notEqual(app.shell?.controls.onOpenProfile, initialCallback);
+    app.shell?.controls.onOpenProfile();
+    assert.deepEqual(app.callbackRevisions, [1]);
+    await app.harness.update(() => {
+      app.list.setAccount({ ...account, credits: 27 });
+      app.list.setSessions([row]);
+    });
+    assert.equal(app.model.account?.credits, 27);
+    assert.equal(app.model.sessions[0]?.id, row.id);
+    await app.navigate(false);
+    assert.equal(app.shell, null);
+    assert.equal(app.model.account?.credits, 27);
+    assert.equal(app.model.sessions[0]?.id, row.id);
+    assert.deepEqual(app.harness.errors, []);
+  } finally { await app.close(); }
+});
+
+test("401 settles signed-out fallback with no shell registration", async () => {
+  const app = await fixture({ unauthorized: true });
+  try {
+    assert.deepEqual(app.harness.errors, []);
+    assert.equal(app.list.signedOut, true);
+    assert.equal(app.list.settled, true);
+    await app.list.ready;
+    assert.equal(app.shell, null);
+    assert.deepEqual(app.model.sessions, []);
+    assert.equal(app.model.account, null);
+    const renders = app.renders;
+    await app.harness.idle();
+    assert.equal(app.renders, renders);
+  } finally { await app.close(); }
+});
diff --git a/frontend/tests/session-list-provider.test.ts b/frontend/tests/session-list-provider.test.ts
index 00c516ef..15db00b1 100644
--- a/frontend/tests/session-list-provider.test.ts
+++ b/frontend/tests/session-list-provider.test.ts
@@ -35,3 +35,15 @@ test("a 401 clears the list and marks signedOut", () => {
 test("session writes no longer invalidate a second cache", () => {
   assert.doesNotMatch(sessionHook, /invalidateSidebarCache/);
 });
+
+test("only the shell consumes registration and it passes Home children through unchanged", () => {
+  assert.match(layout, /const registration = useShellRegistration\(\)/);
+  assert.match(layout, /sessionListSidebarModel\(list, registration\)/);
+  assert.doesNotMatch(layout, /list\.registration|cloneElement/);
+  assert.match(layout, /<SidebarInset[\s\S]*>\s*\{children\}\s*<\/SidebarInset>/);
+  assert.doesNotMatch(page, /useShellRegistration/);
+  const dataValue = provider.slice(provider.indexOf("const value = useMemo"), provider.indexOf("return (", provider.indexOf("const value = useMemo")));
+  assert.doesNotMatch(dataValue, /\bregistration\b/);
+  assert.match(dataValue, /registerShellControls/);
+  assert.match(provider, /<ShellRegistrationContext\.Provider value=\{registration\}>\s*\{children\}/);
+});