diff --git a/packages/client/connection/src/client/index.ts b/packages/client/connection/src/client/index.ts
index 026fc1bf5f..b017d1c9e2 100644
--- a/packages/client/connection/src/client/index.ts
+++ b/packages/client/connection/src/client/index.ts
@@ -21,16 +21,13 @@ export type {
   ClientRequest, ServerResponse, ServerRequest, ClientResponse, RpcMessage, RpcReceipt,
   IApiClient, SessionId, SessionEvent, ContentBlock, StreamChunk,
 } from './api.ts'
-export { RpcId, AbstractApiClient, resultOf, transportError } from './api.ts'
+export { RpcId, AbstractApiClient, transportError } from './api.ts'
 
-// ---- Connection loop ----
-export { ConnectionController } from './connection.ts'
+// ---- Connection loop types (part of the ConnectionHandle.start contract;
+// the controller class itself stays package-internal — apply owns the loop,
+// tests reach it via src) ----
 export type { ConnectionConfig, ConnectionSinks, ConnectionState }
 
-// ---- Platform client subclasses ----
-export { WebApiClient } from './web-api-client.ts'
-export { FixtureApiClient, createFixtureApi } from './fixture.ts'
-
 
 /** Required services (none — this is the wire root). */
 export const inject: string[] = []
diff --git a/packages/client/runtime/src/client/index.ts b/packages/client/runtime/src/client/index.ts
index 6c012fa410..a8ac9d4e51 100644
--- a/packages/client/runtime/src/client/index.ts
+++ b/packages/client/runtime/src/client/index.ts
@@ -15,16 +15,16 @@ import { SlotsService } from './slots.ts'
 import { SessionsService } from './sessions/service.ts'
 import type { ConversationSnapshot, RunningToolCall, ToolResultNode } from './sessions/conversation.ts'
 
+// Contract face only: implementation internals (SessionManager, Session,
+// PAGE_MESSAGES, the lineage/list-snapshot shapes, the block classifier)
+// stay package-internal — tests reach them via src, and downstream packages
+// consume sessions exclusively through the service + snapshot types below.
 export { SlotsService } from './slots.ts'
 export { SessionsService, scopeOf } from './sessions/service.ts'
 export type { SessionBinding, SessionListState, SessionSummary } from './sessions/service.ts'
-export { SessionManager } from './sessions/manager.ts'
-export type { SessionListSnapshot } from './sessions/manager.ts'
-export { Session, PAGE_MESSAGES } from './sessions/session.ts'
-export type { SessionListEntry } from './sessions/lineage.ts'
 export type {
   AssistantBlock, AssistantMessageNode, ContextMessageNode, ConversationNode, ConversationSnapshot,
-  OpenState, PartialAssistant, PendingInteraction, PromptError, RunningToolCall, SteeringMessageNode,
+  PendingInteraction, RunningToolCall, SteeringMessageNode,
   ToolResultNode, UnknownSurfaceNode, UserMessageNode,
 } from './sessions/conversation.ts'
 export type { SessionId } from '@deepseek-ai/dsh-client-connection/client'
diff --git a/packages/client/ui-conversation/README.md b/packages/client/ui-conversation/README.md
index c75077d11d..425122958a 100644
--- a/packages/client/ui-conversation/README.md
+++ b/packages/client/ui-conversation/README.md
@@ -2,7 +2,7 @@
 
 Conversation domain: skeleton (header/tabs/composer/empty state), chat view (grouped step-summary flow, streaming tail isolation), ctx.toolviews named registry with bash samples, minimal details panel, scope-addressed ConversationService. Contract: api-contracts v3 §7.
 
-`src/client/` is organized for the future package split: `contract/` is the sole inter-domain shared face (`slots.ts` composed slot props, `views.ts` view ring, `toolview.ts` tool ring, `tool-call-model.ts`); the `skeleton/`, `chat/`, and `toolviews/` domain directories import contract files and never each other; `apply.ts` is the only assembly point allowed to import all three domains.
+`src/client/` is organized for the future package split: `contract/` is the sole inter-domain shared face (`slots.ts` composed slot props, `views.ts` view ring, `toolview.ts` tool ring, `tool-call-model.ts`); the `skeleton/`, `chat/`, and `toolviews/` domain directories import contract files and never each other; `apply.ts` is the only assembly point allowed to import all three domains. The `/client` export surface is the contract only — `apply`/`inject`, the two service classes, and the `contract/` type families; implementation components (skeleton, chat rows) stay internal and reach the page exclusively through apply's slot registrations (tests take them via the `./src/*` subpath).
 
 ## Model Experience
 
diff --git a/packages/client/ui-conversation/src/client/index.ts b/packages/client/ui-conversation/src/client/index.ts
index 17e9ed88a8..d34b12b0d5 100644
--- a/packages/client/ui-conversation/src/client/index.ts
+++ b/packages/client/ui-conversation/src/client/index.ts
@@ -24,15 +24,9 @@ export type {
   ConversationInjected, ConversationSlotProps, DetailsInjected, DetailsSlotProps,
   EmptyStateInjected, EmptyStateSlotProps,
 } from './contract/slots.ts'
-
-export { ConversationRoot } from './skeleton/ConversationRoot.tsx'
-export type { ConversationRootProps } from './skeleton/ConversationRoot.tsx'
-export { InputBar } from './skeleton/InputBar.tsx'
-export type { InputBarError, InputBarProps } from './skeleton/InputBar.tsx'
-export { EmptyState } from './skeleton/EmptyState.tsx'
-export type { EmptyStateProps } from './skeleton/EmptyState.tsx'
-export { DetailsPanel } from './skeleton/DetailsPanel.tsx'
-export type { DetailsPanelProps } from './skeleton/DetailsPanel.tsx'
+// Skeleton components are implementation detail, not contract: they reach the
+// page exclusively through apply's slot registrations. Tests take them via the
+// "./src/*" subpath (repo convention for internal symbols).
 
 declare module 'cordis' {
   interface Context {
diff --git a/packages/client/ui-conversation/tests/skeleton-branches.spec.tsx b/packages/client/ui-conversation/tests/skeleton-branches.spec.tsx
index 25808e17c5..799a1e1c7f 100644
--- a/packages/client/ui-conversation/tests/skeleton-branches.spec.tsx
+++ b/packages/client/ui-conversation/tests/skeleton-branches.spec.tsx
@@ -9,8 +9,11 @@ import { cleanup, fireEvent, render, waitFor } from '@testing-library/react'
 import { bindSnapshotSelector } from '@deepseek-ai/dsh-client-web-react'
 import type { UseSession } from '@deepseek-ai/dsh-client-web-react'
 import type { ConversationSnapshot, SessionId, SessionSummary } from '@deepseek-ai/dsh-client-runtime/client'
-import { ConversationRoot, DetailsPanel, EmptyState } from '@deepseek-ai/dsh-client-ui-conversation/client'
 import type { SelectionTarget, ViewEntry } from '@deepseek-ai/dsh-client-ui-conversation/client'
+// Internal skeleton components: src-subpath imports (not part of the /client contract).
+import { ConversationRoot } from '@deepseek-ai/dsh-client-ui-conversation/src/client/skeleton/ConversationRoot.tsx'
+import { DetailsPanel } from '@deepseek-ai/dsh-client-ui-conversation/src/client/skeleton/DetailsPanel.tsx'
+import { EmptyState } from '@deepseek-ai/dsh-client-ui-conversation/src/client/skeleton/EmptyState.tsx'
 
 afterEach(cleanup)
 
diff --git a/packages/client/ui-conversation/tests/skeleton.spec.tsx b/packages/client/ui-conversation/tests/skeleton.spec.tsx
index ab23a64389..0d54efe1e0 100644
--- a/packages/client/ui-conversation/tests/skeleton.spec.tsx
+++ b/packages/client/ui-conversation/tests/skeleton.spec.tsx
@@ -12,10 +12,11 @@ import type { FC } from 'react'
 import { bindSnapshotSelector, createSnapshotStore } from '@deepseek-ai/dsh-client-web-react'
 import type { UseSession } from '@deepseek-ai/dsh-client-web-react'
 import type { SessionId, SessionSummary } from '@deepseek-ai/dsh-client-runtime/client'
-import {
-  ConversationRoot, DetailsPanel, EmptyState,
-} from '@deepseek-ai/dsh-client-ui-conversation/client'
 import type { SelectionTarget, ViewEntry, ViewId } from '@deepseek-ai/dsh-client-ui-conversation/client'
+// Internal skeleton components: src-subpath imports (not part of the /client contract).
+import { ConversationRoot } from '@deepseek-ai/dsh-client-ui-conversation/src/client/skeleton/ConversationRoot.tsx'
+import { DetailsPanel } from '@deepseek-ai/dsh-client-ui-conversation/src/client/skeleton/DetailsPanel.tsx'
+import { EmptyState } from '@deepseek-ai/dsh-client-ui-conversation/src/client/skeleton/EmptyState.tsx'
 
 const sid = (s: string): SessionId => s as SessionId
 
diff --git a/packages/client/ui-layout/README.md b/packages/client/ui-layout/README.md
index 6c935f4b9d..69f9d2fa2e 100644
--- a/packages/client/ui-layout/README.md
+++ b/packages/client/ui-layout/README.md
@@ -2,7 +2,9 @@
 
 Shell plugin: three-column AppFrame (drag handles, concession chain) + ctx.layout viewing-state service (nav, panel widths, persist); defines the sidebar/conversation/details/conversation.empty slots. Contract: api-contracts v3 §5.
 
-Slot declarations use the composed-props entry form (`owner` share, no full `props`): the exported OwnerShare contracts are `SidebarOwnerProps` / `ConvOwnerProps` / `DetailsOwnerProps` / `EmptyOwnerProps` — registrants reference them via `OwnerOf<'sidebar' | ...>` and compose their own injected share locally. The `conversation` entry authorizes `conversation.empty` delegation through `children`.
+Slot declarations use the composed-props entry form (`owner` share, no full `props`): the exported OwnerShare contracts are `SidebarOwnerProps` / `ConvOwnerProps` / `DetailsOwnerProps` / `EmptyOwnerProps` — registrants reference them via `OwnerOf<'sidebar' | ...>` and compose their own injected share locally. No entry declares `children` (declaring it requires the registered component to carry the slots face): no P-I slot component delegates — `conversation.empty` is rendered by the shell's assembly closure, not handed down by ConversationRoot.
+
+The export surface is the cross-package contract only: the AppFrame trio (+ `AppFrameProps`) consumed by the web shell's assembly, `LayoutService` with its store shapes (`NavState`/`PanelState`/`ViewId`), and the OwnerShare contracts. The concession-chain solver (`computeColumns`) and its geometry constants are package-internal; tests import them from `/src`.
 
 ## Model Experience
 
diff --git a/packages/client/ui-layout/src/client/index.ts b/packages/client/ui-layout/src/client/index.ts
index e07c5d9896..ceb4ff0b06 100644
--- a/packages/client/ui-layout/src/client/index.ts
+++ b/packages/client/ui-layout/src/client/index.ts
@@ -10,12 +10,13 @@ import type { Context } from 'cordis'
 import type { SessionId } from '@deepseek-ai/dsh-client-runtime/client'
 import { LayoutService } from './service.ts'
 
+// Contract surface only (export-convergence rule: cross-package consumers
+// keep a symbol exported; test-only/package-internal symbols live off /src).
+// AppFrame trio + AppFrameProps: consumed by the web shell's assembly closure.
+// LayoutService: the ctx.layout service class (consumers type against it).
+// PanelState rides AppFrameProps' hooks; NavState/ViewId are service-store
+// shapes referenced through LayoutService's members.
 export { AppFrame, CenterColumn, DetailsColumn, type AppFrameProps } from './AppFrame.tsx'
-export {
-  clampWidth, computeColumns,
-  CENTER_MIN, DETAILS_DEFAULT, DETAILS_MAX, DETAILS_MIN, SIDEBAR_DEFAULT, SIDEBAR_MAX, SIDEBAR_MIN,
-  type Columns, type PanelInput,
-} from './columns.ts'
 export { LayoutService, type NavState, type PanelState, type ViewId } from './service.ts'
 
 declare module 'cordis' {
diff --git a/packages/client/ui-layout/tests/app-frame.spec.tsx b/packages/client/ui-layout/tests/app-frame.spec.tsx
index dfc49be327..9fae776dc4 100644
--- a/packages/client/ui-layout/tests/app-frame.spec.tsx
+++ b/packages/client/ui-layout/tests/app-frame.spec.tsx
@@ -10,7 +10,7 @@ import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import { act, cleanup, render } from '@testing-library/react'
 import { createSnapshotStore } from '@deepseek-ai/dsh-client-web-react'
 import { AppFrame, CenterColumn, DetailsColumn, type PanelState } from '@deepseek-ai/dsh-client-ui-layout/client'
-import { clampWidth } from '@deepseek-ai/dsh-client-ui-layout/client'
+import { clampWidth } from '@deepseek-ai/dsh-client-ui-layout/src/client/columns.ts'
 
 /** Observer stub: captures the callback so tests can fire resizes manually. */
 let fireResize: (() => void) | null = null
diff --git a/packages/client/ui-layout/tests/columns.spec.ts b/packages/client/ui-layout/tests/columns.spec.ts
index 49d351a6d4..66a785e114 100644
--- a/packages/client/ui-layout/tests/columns.spec.ts
+++ b/packages/client/ui-layout/tests/columns.spec.ts
@@ -2,7 +2,7 @@ import { describe, expect, it } from 'vitest'
 import {
   CENTER_MIN, clampWidth, computeColumns,
   DETAILS_DEFAULT, DETAILS_MIN, SIDEBAR_DEFAULT, SIDEBAR_MIN,
-} from '@deepseek-ai/dsh-client-ui-layout/client'
+} from '@deepseek-ai/dsh-client-ui-layout/src/client/columns.ts'
 
 const open = (width: number) => ({ open: true, width })
 const closed = (width: number) => ({ open: false, width })
diff --git a/packages/client/ui-layout/tests/service.spec.ts b/packages/client/ui-layout/tests/service.spec.ts
index 85d458cf7b..d5f784fa0c 100644
--- a/packages/client/ui-layout/tests/service.spec.ts
+++ b/packages/client/ui-layout/tests/service.spec.ts
@@ -9,7 +9,8 @@ import { beforeEach, describe, expect, it } from 'vitest'
 import type { Context } from 'cordis'
 import { createSnapshotStore } from '@deepseek-ai/dsh-client-web-react'
 import type { SessionId, SessionListState } from '@deepseek-ai/dsh-client-runtime/client'
-import { LayoutService, DETAILS_DEFAULT, SIDEBAR_DEFAULT } from '@deepseek-ai/dsh-client-ui-layout/client'
+import { LayoutService } from '@deepseek-ai/dsh-client-ui-layout/client'
+import { DETAILS_DEFAULT, SIDEBAR_DEFAULT } from '@deepseek-ai/dsh-client-ui-layout/src/client/columns.ts'
 
 function makeCtx() {
   const list = createSnapshotStore<SessionListState>({ ids: [], byId: {} })
diff --git a/packages/client/ui-sidebar/README.md b/packages/client/ui-sidebar/README.md
index 25f840ab3d..3e1bfaa11e 100644
--- a/packages/client/ui-sidebar/README.md
+++ b/packages/client/ui-sidebar/README.md
@@ -4,6 +4,8 @@ Sidebar plugin: session multi-level tree (cwd grouping + parentId nesting), sear
 
 `src/client/contract/slots.ts` is the single-domain contract file: `SidebarRootInjected` (the registrant's own injected share — tree hook, current-session hook, actions) and `SidebarRootComponentProps = OwnerOf<'sidebar'> & SidebarRootInjected` (the owner share referenced from ui-layout's slot declaration, never re-stated). `apply` registers SidebarRoot cast-free against that composition; the inject factory binds layout/sessions off `RootBinding<ClientContext>`.
 
+The `/client` export surface is the plugin body (`apply`/`inject`) plus the contract types only — SidebarRoot, the row components, and the tree/store implementation are internal (the slot registration closes over them; tests import src paths directly).
+
 ## Model Experience
 
 None, as the sidebar renders the browser session list; nothing here reaches a model request.
diff --git a/packages/client/ui-sidebar/src/client/index.ts b/packages/client/ui-sidebar/src/client/index.ts
index fab3bc4836..8fd86396db 100644
--- a/packages/client/ui-sidebar/src/client/index.ts
+++ b/packages/client/ui-sidebar/src/client/index.ts
@@ -3,6 +3,10 @@
  * sidebar slot; tree derivation materialized in a plugin-owned snapshot
  * store (pure consumer — no ctx service). Contract: api-contracts v3
  * section 6; props composition in contract/slots.ts.
+ *
+ * Export discipline: the public surface is the plugin body (apply/inject)
+ * plus the contract types. Implementation components and derivation live in
+ * their modules; tests reach them via src paths.
  */
 import type { RootBinding } from '@deepseek-ai/dsh-client-ui-slots'
 import type { ClientContext, SessionId } from '@deepseek-ai/dsh-client-runtime/client'
@@ -10,17 +14,6 @@ import type { SidebarRootInjected } from './contract/slots.ts'
 import { createSidebarTreeStore } from './store.ts'
 import { SidebarRoot } from './SidebarRoot.tsx'
 
-export {
-  deriveRows, formatRelativeTime, projectLabel,
-  UNGROUPED_KEY, UNGROUPED_LABEL,
-  type ProjectRow, type SessionRow, type SidebarRow, type TreeView,
-} from './tree.ts'
-export {
-  createSidebarTreeStore,
-  type GroupBy, type SidebarTreeState, type SidebarTreeStore,
-} from './store.ts'
-export { ProjectRowItem, SessionRowItem } from './Rows.tsx'
-export { SidebarRoot } from './SidebarRoot.tsx'
 export type {
   SidebarActions, SidebarRootComponentProps, SidebarRootInjected, SidebarTreeActions,
 } from './contract/slots.ts'
diff --git a/packages/client/ui-sidebar/tests/sidebar-root.spec.tsx b/packages/client/ui-sidebar/tests/sidebar-root.spec.tsx
index db03c672dd..cdad00f982 100644
--- a/packages/client/ui-sidebar/tests/sidebar-root.spec.tsx
+++ b/packages/client/ui-sidebar/tests/sidebar-root.spec.tsx
@@ -10,10 +10,9 @@ import { cleanup, fireEvent, render, screen } from '@testing-library/react'
 import { act } from 'react'
 import { createSnapshotStore } from '@deepseek-ai/dsh-client-web-react'
 import type { SessionId, SessionListState, SessionSummary } from '@deepseek-ai/dsh-client-runtime/client'
-import {
-  createSidebarTreeStore, SidebarRoot,
-  type SidebarActions, type SidebarTreeStore,
-} from '@deepseek-ai/dsh-client-ui-sidebar/client'
+import { createSidebarTreeStore, type SidebarTreeStore } from '../src/client/store.ts'
+import { SidebarRoot } from '../src/client/SidebarRoot.tsx'
+import type { SidebarActions } from '@deepseek-ai/dsh-client-ui-sidebar/client'
 
 const sid = (s: string) => s as SessionId
 
diff --git a/packages/client/ui-sidebar/tests/store.spec.ts b/packages/client/ui-sidebar/tests/store.spec.ts
index d0bb3b386b..8ded70400c 100644
--- a/packages/client/ui-sidebar/tests/store.spec.ts
+++ b/packages/client/ui-sidebar/tests/store.spec.ts
@@ -1,7 +1,7 @@
 import { describe, expect, it } from 'vitest'
 import { createSnapshotStore } from '@deepseek-ai/dsh-client-web-react'
 import type { SessionId, SessionListState, SessionSummary } from '@deepseek-ai/dsh-client-runtime/client'
-import { createSidebarTreeStore } from '@deepseek-ai/dsh-client-ui-sidebar/client'
+import { createSidebarTreeStore } from '../src/client/store.ts'
 
 const sid = (s: string) => s as SessionId
 
diff --git a/packages/client/ui-sidebar/tests/tree.spec.ts b/packages/client/ui-sidebar/tests/tree.spec.ts
index 1b29d460cf..3919a16d23 100644
--- a/packages/client/ui-sidebar/tests/tree.spec.ts
+++ b/packages/client/ui-sidebar/tests/tree.spec.ts
@@ -3,7 +3,7 @@ import type { SessionId, SessionListState, SessionSummary } from '@deepseek-ai/d
 import {
   deriveRows, formatRelativeTime, projectLabel, UNGROUPED_KEY, UNGROUPED_LABEL,
   type SessionRow, type TreeView,
-} from '@deepseek-ai/dsh-client-ui-sidebar/client'
+} from '../src/client/tree.ts'
 
 const sid = (s: string) => s as SessionId
 
diff --git a/packages/client/ui-trajectory/src/client/index.ts b/packages/client/ui-trajectory/src/client/index.ts
index b65eb3d3ab..8c8ebc330d 100644
--- a/packages/client/ui-trajectory/src/client/index.ts
+++ b/packages/client/ui-trajectory/src/client/index.ts
@@ -9,10 +9,8 @@ import { TrajectoryStatsHeader, type TrajectoryChromeProps } from './TrajectoryS
 import { TrajectoryView } from './TrajectoryView.tsx'
 import { WaterfallView, type WaterfallExtraProps } from './WaterfallView.tsx'
 
-export { deriveSpans, deriveSpanStats, type SpanStats, type TurnSpan } from './spans.ts'
-export { TrajectoryStatsHeader, type TrajectoryChromeProps } from './TrajectoryStatsHeader.tsx'
-export { TrajectoryView } from './TrajectoryView.tsx'
-export { WaterfallView, type WaterfallExtraProps } from './WaterfallView.tsx'
+export type { TrajectoryChromeProps } from './TrajectoryStatsHeader.tsx'
+export type { WaterfallExtraProps } from './WaterfallView.tsx'
 
 declare module '@deepseek-ai/dsh-client-ui-conversation/client' {
   interface ConversationViewMap {
diff --git a/packages/client/ui-trajectory/tests/views.spec.tsx b/packages/client/ui-trajectory/tests/views.spec.tsx
index 41a3c0c95b..a49f77baf2 100644
--- a/packages/client/ui-trajectory/tests/views.spec.tsx
+++ b/packages/client/ui-trajectory/tests/views.spec.tsx
@@ -13,11 +13,14 @@ import { createElement, Fragment, type FC, type ReactNode } from 'react'
 import { bindSnapshotSelector, createSnapshotStore } from '@deepseek-ai/dsh-client-web-react'
 import type { UseSession } from '@deepseek-ai/dsh-client-web-react'
 import type { ConversationSnapshot, SessionId, SessionSummary } from '@deepseek-ai/dsh-client-runtime/client'
-import { ConversationRoot, ConversationService } from '@deepseek-ai/dsh-client-ui-conversation/client'
+import { ConversationService } from '@deepseek-ai/dsh-client-ui-conversation/client'
+import { ConversationRoot } from '@deepseek-ai/dsh-client-ui-conversation/src/client/skeleton/ConversationRoot.tsx'
 import type { ConvViewProps, ViewEntry, ViewId } from '@deepseek-ai/dsh-client-ui-conversation/client'
-import {
-  apply, deriveSpans, deriveSpanStats, inject, TrajectoryStatsHeader, TrajectoryView, WaterfallView,
-} from '@deepseek-ai/dsh-client-ui-trajectory/client'
+import { apply, inject } from '@deepseek-ai/dsh-client-ui-trajectory/client'
+import { deriveSpans, deriveSpanStats } from '@deepseek-ai/dsh-client-ui-trajectory/src/client/spans.ts'
+import { TrajectoryStatsHeader } from '@deepseek-ai/dsh-client-ui-trajectory/src/client/TrajectoryStatsHeader.tsx'
+import { TrajectoryView } from '@deepseek-ai/dsh-client-ui-trajectory/src/client/TrajectoryView.tsx'
+import { WaterfallView } from '@deepseek-ai/dsh-client-ui-trajectory/src/client/WaterfallView.tsx'
 import { apply as nodeApply } from '@deepseek-ai/dsh-client-ui-trajectory'
 
 const SID = 's1' as SessionId