refactor(gui): move the snapshot-store engine into the client runtime

The data layer no longer depends on the React glue package, and business
plugins no longer depend on web-react at all:

- The store engine (zustand vanilla + immer + persist + dev freeze),
  defineStore, and shallowEqual move to @deepseek-ai/dsh-client-runtime,
  exported from the ./client main entry — no ./store subpath survives on
  either package (the web-react one is deleted, none is opened on runtime).
- Store products are bare snapshot sources: useSelector leaves
  SnapshotStore/StoreInstance and Session; every hook is composed at the
  binding site in web-react's renderer (per-source cached uSES binding).
  The SlotRendererHost sessions face carries bare observables only.
- SessionProvider becomes a standard-kit seat: an entry whose children
  declare a session-scope slot receives the framework component as a prop,
  retiring the last value import of web-react from plugin packages.
  UseSession and the session-area types now live in ui-slots.
- web-react shrinks to the shell-only React glue (renderer, providers,
  uSES bridge); zustand/immer belong to runtime alone; the module-table
  seed and tsdown externals drop the web-react/store seat.
- NODE_ENV replacement is defined once in the shared tsdown client preset
  (browser bundles inline the engine and lost vite's define); the 3-line
  process.env typecheck shim moves to runtime with the engine.
- Stray tsc artifacts (.js/.d.ts/.d.ts.map beside sources under src/)
  swept repo-wide; they shadow real sources under vitest resolution.

Verified: both aggregate typecheck programs at zero; 604 client tests
green; repo-wide grep for web-react/store at zero; real-host playwright
run 7/7 including persist round-trip.

ci: fix test/docs

packages/client/ui-layout/src/client/AppFrame.tsx

@@ -4,15 +4,16 @@
  * details), the drag handles (pointer capture + rAF throttle), the concession
  * chain (columns.ts), and the child-slot render decisions: the sidebar slot
  * renders HERE with live parameters from the concession solve, and the
- * session pair renders under the framework-wired SessionProvider (render-prop
- * form; session slots get sessionId as a framework-standard prop, so the
- * owner shares stay empty). Pure component: everything arrives through the
- * four prop shares — zero cordis imports, zero self-made hooks.
+ * session pair renders under the SessionProvider standard seat (render-prop
+ * form, injected by the renderer because the children declaration contains
+ * session-scope slots; session slots get sessionId as a framework-standard
+ * prop, so the owner shares stay empty). Pure component: everything arrives
+ * through the four prop shares — zero cordis or framework imports, zero
+ * self-made hooks.
  */
 import { useCallback, useEffect, useRef, useState } from 'react'
 import type { ReactNode } from 'react'
 import type { PropsRenderSlots, PropsRuntime, PropsStore } from '@deepseek-ai/dsh-client-ui-slots'
-import { SessionProvider } from '@deepseek-ai/dsh-client-web-react'
 import { computeColumns } from './columns.ts'
 import type { createLayoutStore } from './stores.ts'
 import css from './AppFrame.module.css'
@@ -78,8 +79,8 @@ function DragHandle(props: { left: number; onStart: () => void; onDrag: (dx: num
   )
 }
 
-/** The three-column frame (see module doc). */
-export function AppFrame({ useStore, actions, renderSlot }: AppFrameProps) {
+/** The three-column frame (see module doc). SessionProvider arrives as a standard seat (declaring a session-scope child summons it — no framework import). */
+export function AppFrame({ useStore, actions, renderSlot, SessionProvider }: AppFrameProps) {
   const panels = useStore((s) => s)
   const frameRef = useRef<HTMLDivElement | null>(null)
   const [viewport, setViewport] = useState(() => window.innerWidth)

packages/client/ui-layout/src/client/stores.ts

@@ -7,7 +7,7 @@
  * derives its PropsStore share from the return type, and the service face
  * receives the bound actions through the registration's inject hook.
  */
-import { defineStore } from '@deepseek-ai/dsh-client-web-react'
+import { defineStore } from '@deepseek-ai/dsh-client-runtime/client'
 import {
   clampWidth, DETAILS_DEFAULT, DETAILS_MAX, DETAILS_MIN,
   SIDEBAR_DEFAULT, SIDEBAR_MAX, SIDEBAR_MIN,