v2.10.3

Cap-notification instrumentation.

The free-tier cap banner now reports whether it was actually delivered. A zero conversion rate was unreadable while "nobody paid" could not be told apart from "nobody was ever shown a paywall" — the LogBox banner is the only cap channel observable from the server, so its delivery is recorded with threshold, delivered and a reason. The reason separates a real delivery failure from a channel that never had a chance to fire (no app connected is not a bug).

Both cap notifiers also receive the calling tool's device. With one app connected an undefined device already resolved to it, but with several connected it resolved to "ambiguous" and the banner was dropped in silence.

No tool surface changes.