* fix(#965): emit structured json error for unexpected handler throws under --json-errors
When GSD_JSON_ERRORS=1 / --json-errors is active, an unexpected (non-ExitError) throw
in a handler now emits { ok: false, reason: "sdk_fail_fast", message } to stderr instead
of a raw stack trace. The plain-text behaviour (no json-error mode) is unchanged.
Closes#965
* chore(#965): backfill changeset pr number (987)
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