NestJS resolves a guard referenced via @UseGuards(SomeGuard) using the
consuming module's injector, not the guard's own declaring module's
injector. OidcAuthGuard and TripMembershipGuard are shared across
several feature modules, so every constructor dependency they need
(UsersRepository/UsersService, TripMembersRepository, etc.) must be
re-exported by AuthModule/TripsLibModule/UsersLibModule, not just the
guard classes themselves. Found via the Phase 02 end-to-end smoke test
against a mocked IdP, which failed to boot the API before this fix.
