createInvite returned { error: 'Trip not found', status: 404 } and the admin controller never looked at it: POST /api/admin/invites with an unknown trip_id answered 201 with an empty body and wrote an admin.invite_create audit row for resource 'undefined'. The service throws the DomainError now, so the route answers 404 { error: 'Trip not found' } and writes neither the invite nor the audit row.
The ratchet only read *.service.ts for status literals and one branch shape in controllers and tools, so an envelope in a helper, impl or provider file, a branch written as result.error === 'not_found', and RPC handlers all went uncounted. It now counts the literals in every file under src/nest outside the HTTP layer, and comparisons, negations, optional chains and ternaries on a returned error in controllers, tools and RPC handlers. The baseline takes what the wider count finds.
Maurice