The global session-status store patched its own setState to derive
active membership for callers replacing statusById — a boundary that
silently trusted any caller passing both fields to keep them consistent.
replaceGlobalSessionStatusById is now the one sanctioned way to swap the
map from outside the event reducers; the runtime-switch reset and the
tests that replaced the map directly go through it, and the patch is
gone. Follow-up to #3126 review.
Bohdan Triapitsyn
428854fd78