`on_crash` receives an event without scope data

[jpnurmi]

All backends invoke on_crash before applying the current scope. In pseudo:

if (on_crash)
    on_crash(event);

apply_scope(event);

if (before_send && !on_crash)
    before_send(event);

Unlike before_send, the on_crash callback therefore cannot inspect contexts, tags, user, release, environment, or any other scope data for filtering purposes.

With minidump backends, the event contains only event_id, timestamp, platform, and level:

{"event_id":"bcb1c3eb-6bf6-497d-1880-e942cafe61e8","timestamp":"2026-09-17T07:10:47.960701Z","platform":"native","level":"fatal"}

Since on_crash replaces before_send for crashes, it should probably receive the same scope-enriched event, consistent with the normal before_send contract.

[linear-code]

NATIVE-230