test(trigger-record-change): cast the registry to the file's own test seam

`objectql.registry` is typed `EngineSchemaRegistryView` here, which declares no
`registerObject`; the file already carries a structural `TestObjectRegistry` for
exactly that and casts to it two lines up. tsc --noEmit TS2339, fixed by using
the same cast.

Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01URLHobLUJB9K1ABV6ofdjj

Author: claude

packages/triggers/trigger-record-change/src/before-update-flow-payload-reach.test.ts

@@ -894,7 +894,7 @@ describe('[#15356/#14744] S5 on the real SQL driver — the mutation reaches no
     // [#17985] The authz resolver's own reads, registered before the sync so
     // they are provisioned rather than refused.
     for (const o of authzResolverObjects) {
-      objectql.registry.registerObject(o.def as never, o.owner);
+      (objectql.registry as unknown as TestObjectRegistry).registerObject(o.def as never, o.owner);
     }
     await objectql.syncSchemas();