Improve thread-safety and reconnection reliability for hasPublished flag #814
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@davidliu, this PR cherry-picks the independent fixes from #797 that remain valuable after #813 was merged.
Changes:
@VolatiletohasPublishedfor proper memory visibility across threadshasPublished = truebefore the connection check so reconnect() can re-trigger negotiation even if the first attempt occurs before Signal connectsThese changes improve thread-safety and fix a reconnection edge case where the publisher intent could be lost if negotiation was triggered before the signal client connected.