MCP status and skills were cleared on a switch but their in-flight requests
were not, so a response for the previous instance could still write itself over
the new one's — the same race the quota store already guards. Both now carry a
generation.
Usage also claimed an instance as loaded before it had answered, so a load that
failed on a cold or briefly unreachable instance was never attempted again, and
the previous instance's display mode and provider selection survived a switch —
which decided what the new instance was even asked for.
Bohdan Triapitsyn
f0ced9d361