ensureSyncIndexes
ensureSyncIndexes():
Promise<void>
C8: await every enqueued sync index creation — per-model snapshot indexes from
registerSync plus the bookkeeping-model indexes from SyncApp.register — throwing on
the first failure. Called at server startup by TerrenoApp.start() (after all models
and plugins register) so a missing index fails the boot loudly rather than silently
degrading the snapshot query to a table scan or breaking mutation idempotency.
Returns
Promise<void>