TLA+ safety model#229
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This helps validate some invariants never happen like authentication bypass, packets are not forged, etc. Currently it does not support the liveness part of TLA+.
Instead of having a parallel, hand-written state machine for channels, convert it to use its own KStateMachine. This will allow us to model the behavior using TLA+ like the main state machine.
Before there was a vacuity problem with proving the safety of channels around rekey. Re-arrange the state machine to allow TLA+ to prove it is okay.
This helps with some claims about the registry we want to make with the TLA+ model.
Global actions should not interfere with channels unless it is a disconnect effect.
Rewriting the flow for TLA+ made a slight race condition.
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