- disconnectInstance: save cached tokens BEFORE filtering the instance out, so
reconnectInstance can restore disconnected entries from localStorage
- reconnectInstance: if instance is not in active instances array, attempt to
restore it from cached localStorage token before proceeding with reconnect
- reconnectInstance: update registry to unreachable/auth_expired on failure
- forceRemoveEntry: now tears down WS, removes from instances array, purges
token from localStorage, and cleans up space store (was registry-only before)