refactor(gui): one plugin-package shape — dshClient manifests, clientBundle preset, purity gate over all nine

Every client plugin package carries dshClient ({platform, inject,
immediately?}) and emits lib/client.js through the shared clientBundle
preset; exports["./client"] points at the bundle. The infrastructure
tier (connection, runtime, ui-theme, i18n, hmr) declares immediately: true
in its manifest — absent means lazy. The bundle purity gate covers all
nine packages: platform modules stay external, INLINE_SAFE wire layers
inline, any other cross-plugin value import is a build error. Migrations
that rule forced: scopeOf became a SessionsService method and
transportError moved into dsh-host-apiproxy's wire layer; the store
engine stays in runtime under a documented temporary exemption
(TODO(webload/store-rehome)).

packages/client/connection/src/client/api.ts

@@ -14,7 +14,10 @@ export type {
   RpcRequest, RpcResponse, RpcResult, RpcError, RpcErrorCode,
   ClientRequest, ServerResponse, ServerRequest, ClientResponse, RpcMessage, RpcReceipt,
 } from '@deepseek-ai/dsh-host-apiproxy/api'
-export { RpcId } from '@deepseek-ai/dsh-host-apiproxy/api'
+// transportError moved down to the apiproxy api layer (it belongs beside
+// RpcResult, its subject); re-exported here so connection consumers keep one
+// contract entry point.
+export { RpcId, transportError } from '@deepseek-ai/dsh-host-apiproxy/api'
 export { AbstractApiClient } from '@deepseek-ai/dsh-host-apiproxy/client'
 export type { IApiClient } from '@deepseek-ai/dsh-host-apiproxy/client'
 export type { SessionId, SessionEvent } from '@deepseek-ai/dsh-session/types'
@@ -31,16 +34,3 @@ import type { RpcResponse, RpcResult } from '@deepseek-ai/dsh-host-apiproxy/api'
 export function resultOf<T>(response: RpcResponse<T>): RpcResult<T> {
   return response.result
 }
-
-/**
- * Fold a transport exception into the RpcResult error branch (unified error
- * surface; 'internal' as the catch-all code).
- * @param error - the thrown value from the carrier.
- * @returns the error branch of an RpcResult.
- */
-export function transportError<T>(error: unknown): RpcResult<T> {
-  return {
-    ok: false,
-    error: { code: 'internal', message: error instanceof Error ? error.message : String(error), details: {} },
-  }
-}