test(dogfood): update env-authored managed_by assertions to 'admin' (A4 vocab)

A4 unified record-level managed_by onto platform/package/admin; env-authored
permission sets now project as 'admin' (formerly 'user'). Update the two
showcase-permission-projection assertions the vocab change made stale.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019QRUvVfpvSycAHMMF2xTxs

Author: claude

packages/dogfood/test/showcase-permission-projection.dogfood.test.ts

@@ -59,7 +59,7 @@ describe('sys_permission_set pure projection (ADR-0094)', () => {
     // env-owned, not forged package provenance.
     const row = await findSet(NAME);
     expect(row, 'record projected synchronously with the create').toBeTruthy();
-    expect(row.managed_by).toBe('user');
+    expect(row.managed_by).toBe('admin');
     expect(JSON.parse(row.object_permissions)).toEqual({ crm_lead: { allowRead: true } });
 
     // …and the authoritative store is the metadata overlay, not the row.
@@ -163,7 +163,7 @@ describe('sys_permission_set pure projection (ADR-0094)', () => {
     // the projector, not left invisible as before ADR-0094).
     const row = await findSet(NAME);
     expect(row, 'Studio-authored env set appears in Setup').toBeTruthy();
-    expect(row.managed_by).toBe('user');
+    expect(row.managed_by).toBe('admin');
     expect(JSON.parse(row.object_permissions)).toEqual({ crm_lead: { allowRead: true } });
   });
 });