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/ui-trajectory/tests/client-bundle.spec.ts

@@ -1,7 +1,7 @@
 // @vitest-environment jsdom
 /**
  * Real tsdown artifact shape: lib/client.js hands off through
- * window.DSHClientProxy.loadPlugin, resolves externals through the injected
+ * window.__ModuleLoader__.load, resolves externals through the injected
  * require, returns the export surface (apply + inject), and a mounted apply
  * registers both view tabs into a real SlotsService ring. Skips when dist/ is
  * not built (`pnpm --filter @deepseek-ai/dsh-client-ui-trajectory bundle`).
@@ -15,7 +15,7 @@ import { SlotsService } from '@deepseek-ai/dsh-client-runtime/client'
 const PLUGIN_ID = '@deepseek-ai/dsh-client-ui-trajectory'
 
 interface Handoff { id: string; factory: (require: (spec: string) => unknown) => Record<string, unknown> }
-type Win = { DSHClientProxy?: { loadPlugin(h: Handoff): void } }
+type Win = { __ModuleLoader__?: { load(h: Handoff): void } }
 
 function readBundle(): string | undefined {
   try {
@@ -28,7 +28,7 @@ function readBundle(): string | undefined {
 }
 
 afterEach(() => {
-  delete (window as Win).DSHClientProxy
+  delete (window as Win).__ModuleLoader__
   for (const el of document.querySelectorAll('style')) el.remove()
 })
 
@@ -37,7 +37,7 @@ describe('tsdown client artifact', () => {
 
   async function loadArtifact() {
     let handoff: Handoff | undefined
-    ;(window as Win).DSHClientProxy = { loadPlugin: (h) => { handoff = h } }
+    ;(window as Win).__ModuleLoader__ = { load: (h) => { handoff = h } }
     // Same execution form the loader uses (inline script eval, window scope) —
     // the implied-eval ban targets accidental string execution, not this
     // deliberate bundle-execution fixture.