Returns a single security record by ISIN across all asset classes.
If the identifier is not an ISIN, the service attempts to auto-detect
the symbol type and resolve it to the underlying ISIN.

Asset-type caches are consulted in the order given by the
resolution_order query parameter (or the default order when omitted).
Asset types not listed in resolution_order are not searched.

The equity type also covers pre-listing (IPO) securities: if an
identifier misses the listed equity feed, primary-market reference data
is consulted. Those records are shaped like any other equity —
asset_type=equity, asset_subtype=Stock — with status=pre_issuance
marking them as not yet trading. A listed record always wins over a pre-listing one.
Pre-listing records are reachable only by identifier lookup, not from
/v1/security/snapshot.