LibXMTP is a shared library encapsulating the core functionality of the XMTP messaging protocol, such as cryptography, networking, and language bindings.
The reinit PSKs need to be stored because OpenMLS needs them as part of the group state right now.
Two checks are needed to prevent reinit PSKs from being used
Block any ReInit proposal
Block any Welcome with a PreSharedKeyID of type resumption with usage reinit
Here is the relevant section of the MLS spec: https://www.rfc-editor.org/rfc/rfc9420.html#name-reinitialization
We don't have the resources to support this feature properly, therefore we should block it from happening