Initial scaffold: @ng-eventually/client — SDK-shaped polyfill over NextGraph

Generic polyfill layer that makes a single NextGraph broker behave like the
not-yet-shipped multi-user NextGraph (emulated capabilities + inbox). Zero app domain.

@ng-eventually/client exposes an SDK-identical surface (ng, useShape, inbox); the
polyfill bootstrap (configure + capability helpers) is isolated under /polyfill, so
the main entry stays a drop-in for @ng-org/web|orm. The real SDK is injected at
configure() (no hard import → build-alias safe + testable).

Scaffold: NextGraph wiring stubbed with TODO; capability helpers implemented and
unit-tested (4 tests, typecheck clean). The global-index curator is deferred — in
NextGraph apps/services are mono-user with no global data.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/client/src/index.ts

@@ -0,0 +1,21 @@
+/**
+ * @ng-eventually/client — **SDK-identical** surface.
+ *
+ * This entry exposes ONLY what `@ng-org/web` / `@ng-org/orm` expose (current +
+ * anticipated: `inbox`). Import `ng` / `useShape` from here instead of the SDK
+ * during the polyfill period; at migration the build alias is removed and these
+ * resolve to the real SDK with **no code change**.
+ *
+ * The one non-SDK piece — the polyfill bootstrap (`configure`, capability
+ * helpers, current user) — lives at `@ng-eventually/client/polyfill`, and is the
+ * only thing removed at migration.
+ */
+
+export * from "./types";
+export { useShape } from "./use-shape";
+export * as inbox from "./inbox";
+
+import { makeNg } from "./ng-proxy";
+
+/** SDK-identical `ng` (wrapped). Drop-in replacement for `@ng-org/web`'s `ng`. */
+export const ng: Record<string, any> = makeNg();