Merge changes I48eafb5a,I4d7d79b4,I1611c616,If1b79600,I534bcb7f, ... into main

* changes:
  [kairos] Remove unneeded sub-scopes for KairosActivatables
  [kairos] cache switch-off event for TransactionScope.now
  [kairos] drop Output upstream ref on death
  [kairos] cache upstream patches node for MuxPrompt
  [kairos] Cache derived State as field in viewmodel
  [kairos] Cache end events for state scopes
  [kairos] Optimize internal map wrappers