test(service-datasource): type the harness app off the adapter's own accessor

`tsc --noEmit` reds on a hand-written `{ fetch: (req: Request) => Promise<Response> }`:
Hono's `fetch` takes an env and an execution context after the request, so the
narrower signature is a type error rather than a simplification.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ARYe3yQTQCUFm5qPYNgKaJ

Author: claude

packages/services/service-datasource/src/__tests__/admin-routes-tenancy-posture-admission.test.ts

@@ -228,7 +228,13 @@ function kernelFor(wiring: Wiring): ObjectKernel | undefined {
 }
 
 interface Harness {
-  app: { fetch: (req: Request) => Promise<Response> };
+  /**
+   * The raw Hono app, typed off the adapter's own accessor rather than
+   * restated as a narrower `{ fetch }` shape — Hono's `fetch` takes an env and
+   * an execution context after the request, so a hand-written signature is a
+   * type error, not a simplification.
+   */
+  app: ReturnType<HonoHttpServer['getRawApp']>;
   /** Every datasource row the fixture holds, in insertion order. */
   store: () => DatasourceRow[];
   service: ReturnType<typeof createServiceDouble>;