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-slots/src/index.ts

@@ -14,7 +14,7 @@
  * consumer merges keys in and the intersection is what keeps them string-typed.
  * The rule fires on the empty-map view, not on real redundancy. */
 import type { ReactNode } from 'react'
-import type { BoundActions, HandleOf, PropsStore, StoreDecl } from './store.ts'
+import type { BoundActions, HandleOf, PropsStore, SnapshotSelectorHook, StoreDecl } from './store.ts'
 
 export * from './store.ts'
 export * from './renderer.ts'
@@ -98,6 +98,32 @@ export type PropsRuntime<K extends keyof SlotMap & string> =
 /** renderSlot dispatch options: keyed dispatch key, list filtering, empty fallback. */
 export interface RenderOpts { entryKey?: string; only?: string; fallback?: ReactNode }
 
+/**
+ * Conversation-session selector hook alias for props contracts. Wide by
+ * default at this dependency-inverted layer; the runtime narrows at its
+ * export seam (`UseSession<ConversationSnapshot>`).
+ */
+export type UseSession<Snap extends object = object> = SnapshotSelectorHook<Snap>
+
+/** Props of the standard-kit SessionProvider seat (render-prop form). */
+export interface SessionAreaProps {
+  /** No-session body (also covers a current id whose session cannot be resolved). */
+  empty?: (() => ReactNode) | undefined
+  /** Session body; the framework remounts it per session (key=sessionId). */
+  children: (sessionId: SessionIdOf) => ReactNode
+}
+
+/**
+ * The framework-wired session area component (slot terminal design §7):
+ * subscribes to the current-session selection internally (design fiat ① —
+ * selection authority lives with runtime sessions) and switches between the
+ * session body and the empty branch. Delivered as a standard seat to every
+ * entry whose children declaration contains a session-scope slot (the
+ * derivation rides {@link PropsRenderSlots}); the value is injected by the
+ * installed renderer — business code never imports it.
+ */
+export type SessionProviderComponent = (props: SessionAreaProps) => ReactNode
+
 /**
  * Child-slot render share: `renderSlot` statically narrowed to the entry's
  * declared children keys. Delegation is plain props passing (hand
@@ -117,7 +143,12 @@ export type PropsRenderSlots<S extends keyof SlotMap & string> = {
    */
   renderSlot: <K extends S>(key: K, owner: OwnerOf<K>, opts?: RenderOpts) => ReactNode
   readonly __renders?: ((key: S) => void) | undefined
-}
+} & ('session' extends ScopeOf<S>
+  // The SessionProvider seat rides the same source as renderSlot: declaring
+  // a session-scope child is what makes a session area exist, so the seat
+  // derives from the children key set's scopes (renderer injects the value).
+  ? { SessionProvider: SessionProviderComponent }
+  : object)
 
 /**
  * Registration-position component shape: the bare call signature, so composed

packages/client/ui-slots/src/renderer.ts

@@ -16,19 +16,33 @@ export interface HostObservable<T> {
 
 /**
  * Type-erased store instance face at the render seam (the typed twin is
- * {@link StoreInstance}): selector hook plus draft-stripped action callbacks.
- * Typing lands at the component seam via {@link PropsStore}.
+ * {@link StoreInstance}): a bare snapshot source plus the draft-stripped
+ * action callbacks. No React hook crosses this seam — the render machinery
+ * binds `useStore` from the source at its own side (cached per instance);
+ * typing lands at the component seam via {@link PropsStore}.
  */
 export interface StoreInstanceLike {
-  readonly useSelector: unknown
+  /** Current state snapshot (uSES getSnapshot side). */
+  getSnapshot(): unknown
+  /**
+   * Subscribe to state changes (uSES subscribe side).
+   * @param fn - change callback.
+   * @returns unsubscribe.
+   */
+  subscribe(fn: () => void): () => void
+  /** Baked write callbacks (delivered to components as `actions`). */
   readonly actions: Record<string, (...params: never[]) => void>
 }
 
 /** Session standard kit resolved per session id (identity-stable per session scope; a recreated scope yields a new cell). */
 export interface SessionCell {
   sessionId: string
-  /** Bound conversation-snapshot selector hook (wide here; runtime narrows at its export seam). */
-  useSession: unknown
+  /**
+   * Bare conversation-snapshot source (wide here; runtime narrows at its
+   * export seam). The React side binds the `useSession` hook per cell —
+   * hooks never appear on the host contract.
+   */
+  session: HostObservable<unknown>
 }
 
 /** renderSlot dispatch options at the machinery level: keyed dispatch key, list filtering, empty fallback. */

packages/client/ui-slots/src/store.ts

@@ -51,19 +51,19 @@ export interface StoreSpec<T, A extends ActionsDecl<T>> {
 
 /**
  * Live engine instance: the create() product consumed by the render machinery
- * and by component tests (fed straight into props as useStore/actions).
- * Production components and render paths never call create() themselves —
- * instance lifecycle is the framework's.
+ * and by tests. A bare snapshot source plus the baked write set — no React
+ * hook rides the engine product (the engine lives in the React-free runtime);
+ * the render machinery binds the `useStore` hook from this source on its own
+ * side, cached per instance. Production components and render paths never
+ * call create() themselves — instance lifecycle is the framework's.
  */
 export interface StoreInstance<T, A extends ActionsDecl<T>> {
-  /** Selector hook bound to this instance (delivered to components as `useStore`). */
-  readonly useSelector: SnapshotSelectorHook<T>
   /** Baked write callbacks (delivered to components as `actions`). */
   readonly actions: BakedActions<T, A>
-  /** Current state snapshot (test assertions; machinery). */
+  /** Current state snapshot (uSES getSnapshot side; test assertions). */
   getSnapshot(): T
   /**
-   * Subscribe to state changes.
+   * Subscribe to state changes (uSES subscribe side).
    * @param fn - change callback.
    * @returns unsubscribe.
    */
@@ -130,8 +130,8 @@ export type PropsStore<H> = H extends StoreHandle<infer T, infer A>
   : object
 
 /**
- * The defineStore contract (implementation lives in web-react, bound to the
- * snapshot-store engine): spec in, handle out, with T inferred from `init`
- * and the actions table constrained by T.
+ * The defineStore contract (implementation lives in the runtime package,
+ * bound to the snapshot-store engine): spec in, handle out, with T inferred
+ * from `init` and the actions table constrained by T.
  */
 export type DefineStore = <T, A extends ActionsDecl<T>>(spec: StoreSpec<T, A>) => StoreHandle<T, A>