The terminal pane's registry-scoped lookup keys sshConnections with
backendScopeKey(connectionId, profile), but the pool's single writer
publishes every tunnel under its per-profile bootstrap key with the
registry connection stamped on the entry. The lookup can never hit, so
a v2 registry SSH terminal pane stays 'pending' forever (#97345).
Fall back to the entry stamped with the window's connection id - the
same identity match managedSshScopeRole applies to pool entries - and
return the writer's actual scope so downstream getSshConnectionState
and teardown keep working.
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