Document the ZTag / SAPID external-ID reservation subsystem: what a
reservation is, why it sits outside the generation flow (decision #124),
the ExternalIdReservation table, the lifecycle (author → publish
precheck → publish-time MERGE → FleetAdmin release), and the
/reservations Admin page. Linked from the docs README Operational table.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
