disconnectInstance and forceRemoveEntry now run
failoverDmOriginsFromDisconnected BEFORE removeInstanceSpaces so any DM
with a connected sibling survives the disconnect via rekey; only DMs
without alternatives are cleared alongside the rest of the instance.
Switched setInstanceStatus to the same static import (dmOriginFailover
lazily reads store state, so no import cycle).
When an instance transitions from 'connected' to 'disconnected' or
'error', fire failoverDmOriginsFromDisconnected for that origin. Dynamic
import preserves the circular-dep-safe resolver pattern used elsewhere
in instanceStore. Fire-and-forget; the failover utility reads fresh
state at call time.
Jannis Braun