feat(core-audit): package barrel exports

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/core-audit/src/stdout-json-audit-log.test.ts

@@ -16,7 +16,8 @@ const sample: AuditEntry = {
 };
 
 describe("StdoutJsonAuditLog", () => {
-  let writeSpy: ReturnType<typeof vi.spyOn>;
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  let writeSpy: ReturnType<typeof vi.spyOn<any, any>>;
   beforeEach(() => {
     writeSpy = vi.spyOn(process.stdout, "write").mockImplementation(() => true);
   });