vector_await_transaction's confirmation check only ever looked for an
unspent output at index 0 - a heuristic that can read a landed transaction
as unconfirmed, since these tools broadcast CBOR signed elsewhere with no
guarantee of that output existing or staying unspent. The check also wrapped
the lookup in .catch(() => []), collapsing genuine infrastructure failures
(Ogmios down, malformed response) into the same "not confirmed yet" result,
defeating pollUntilConfirmed's documented contract that a check rejection
should propagate.
OgmiosProvider.getKoiosTxStatus + koiosIndicatesConfirmed (shared/provider.ts)
now provide a direct, non-swallowing Koios tx_status check; poll.ts's new
buildConfirmationCheck picks it when VECTOR_KOIOS_URL is configured and
falls back to the outRef heuristic (also no longer swallowing errors)
otherwise - the same preference order OgmiosProvider.awaitTx already used,
without reusing awaitTx itself (still not caller-configurable, still
swallows every failure). awaitTx stays in place only because the Provider
interface requires it; nothing else calls it.
buildConfirmationCheck and koiosIndicatesConfirmed are unit tested via
dependency injection, the same pattern poll.test.ts already uses for
now/sleep, with no network access required.
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