Merge remote-tracking branch 'origin/worktree/web-multimodal-image-input' into worktree/web-multimodal-image-input

# Conflicts:
#	.agents/notes/implemented/feature/2026-07-22-web-multimodal-image-input-and-durable-attachments.i18n.yaml
#	apps/web/tests/code-mode-fixture.snapshot.ts
#	apps/web/tests/image-display.snapshot.ts
#	docs/architecture.i18n.yaml
#	docs/module-graph.md
#	packages/client/test-runtime/tests/runtime.spec.tsx
#	packages/client/ui-conversation/src/client/skeleton/ConversationSession.tsx
#	packages/client/ui-conversation/tests/terminal-card.spec.tsx
#	packages/client/ui-trajectory/src/client/layout.ts

packages/client/runtime/src/client/contract/sessions.ts

@@ -8,7 +8,7 @@
  * explicit act of widening what features may do to the sessions domain.
  */
 import type { Context } from 'cordis'
-import type { HostDescription, SessionId } from '@deepseek-ai/dsh-client-connection/client'
+import type { SessionId } from '@deepseek-ai/dsh-client-connection/client'
 import type { HostObservable, SessionMaybeProvideInfo } from '@deepseek-ai/dsh-client-ui-slots'
 import type {
   SessionBinding, SessionListState, SessionProvideDescriptor,
@@ -22,11 +22,6 @@ export interface ISessions {
   readonly list: ObservableSnapshot<SessionListState>
   /** Atomic current-session provide projection (the renderer host's `sessions.provideInfo` feed). */
   readonly currentProvideInfo: HostObservable<SessionMaybeProvideInfo>
-  /**
-   * Read the latest successfully received host capability description.
-   * @returns host capabilities, or undefined before the first successful handshake.
-   */
-  hostDescription(): HostDescription | undefined
   /**
    * Select a session as current.
    * @param id - session id (must exist in the list; unknown ids fail loud).

packages/client/runtime/src/client/index.ts

@@ -178,7 +178,6 @@ export function apply(ctx: Context): void {
         console.error('[web-runtime] history host-frame routing failed:', error)
       }
     },
-    onDescription: (description) => { sessions.handleDescription(description) },
     onConnected: () => {
       sessions.handleConnected()
       workspaces.handleConnected()

packages/client/runtime/src/client/sessions/service.ts

@@ -17,7 +17,7 @@
  */
 import type { Context, Fiber } from 'cordis'
 import type {
-  HostDescription, IApiClient, RpcError, SessionId, WorkspaceId,
+  IApiClient, RpcError, SessionId, WorkspaceId,
 } from '@deepseek-ai/dsh-client-connection/client'
 import type {
   HostObservable, SessionMaybeProvideInfo, SessionProvideInfo,
@@ -191,7 +191,6 @@ export class SessionsService implements ISessions {
   private watched: SessionId | undefined
   /** Removed-while-staged sessions whose teardown waits for the stage to move away. */
   private readonly deferredRemovals = new Set<SessionId>()
-  private description: HostDescription | undefined
 
   /**
    * @param ctx - client root context (scope fibers mount under it).
@@ -231,22 +230,6 @@ export class SessionsService implements ISessions {
     rootCtx.reflect.provide('sessions', this, undefined)
   }
 
-  /**
-   * Store the latest successful connection-generation host description.
-   * @param description - capability and deployment snapshot from `host.describe`.
-   */
-  handleDescription(description: HostDescription): void {
-    this.description = description
-  }
-
-  /**
-   * Read the latest host capability snapshot.
-   * @returns the last successful description, or undefined before connection.
-   */
-  hostDescription(): HostDescription | undefined {
-    return this.description
-  }
-
   /**
    * Register a per-session standard-props provider: every session-scope slot
    * component receives the contributed members as standard props (`hooks`

packages/client/runtime/tests/client-apply.spec.ts

@@ -74,12 +74,6 @@ describe('runtime client apply', () => {
     expect(workspaces.list.getSnapshot().items[0]?.workspaceId).toBe('w-new')
     // Mux sink and onConnected route without throwing (manager semantics own the behavior).
     bench.sinks?.onMuxEnvelope?.({ rpcId: 'r2' as never, payload: { type: 'stream/error', message: 'x' } as never })
-    bench.sinks?.onDescription?.({ version: '0', cwd: '/f', attachedSessions: 0 })
-    expect((sessions as { hostDescription(): unknown }).hostDescription()).toEqual({
-      version: '0',
-      cwd: '/f',
-      attachedSessions: 0,
-    })
     bench.sinks?.onConnected?.()
   })