Returns true once initialize has fully completed (process ID assigned, emitter ready,
and — outside the main process — initial store data synced). Used to distinguish "value genuinely
absent" from "shared store not initialized yet" for optional reads that have a sensible default.
Returns
trueonce initialize has fully completed (process ID assigned, emitter ready, and — outside the main process — initial store data synced). Used to distinguish "value genuinely absent" from "shared store not initialized yet" for optional reads that have a sensible default.