feat(client): complete SDK-shaped surface — init/initNg + SDK type re-exports

lifecycle.ts forwards init (@ng-org/web) and initNg (@ng-org/orm) to the injected
SDK; index re-exports the SDK types (ShapeType, BaseType, Schema, DeepSignalSet, NG) so
consumers import everything from @ng-eventually/client. Type re-exports are erased at
build → no runtime @ng-org import added (no duplicate SDK copy). @ng-org added as
devDependencies (typecheck only) + peerDependencies. EventuallyConfig accepts init/initNg.
Typecheck + 4 tests green.

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

packages/client/src/polyfill.ts

@@ -19,6 +19,10 @@ export interface EventuallyConfig {
   sharedWallet?: { name: string; secret: string };
   /** Initial current user; may also be set later via {@link setCurrentUser}. */
   currentUser?: PrincipalId;
+  /** REAL `@ng-org/web` `init` (lifecycle) — forwarded by the lib's `init()`. */
+  init?: (...args: any[]) => any;
+  /** REAL `@ng-org/orm` `initNg` (ORM signals) — forwarded by the lib's `initNg()`. */
+  initNg?: (...args: any[]) => any;
 }
 
 let cfg: EventuallyConfig | null = null;