#### Direct Execution __typename & null backfill
##### __typename filling
The direct execution path now correctly derives __typename at every
level of the GraphQL response:
Connection types — CompanyConnection, CompanyEdge, Company, PageInfo
GroupBy types — TaskGroupByConnection (was incorrectly producing
TaskConnection)
Composite fields — Links, FullName, Currency, etc. handled by a
dedicated formatter (was inheriting the parent object's typename)
Previously, __typename was derived from the object's universal
identifier (a UUID), producing broken values like
20202020B3744779A56180086Cb2E17FConnection.
##### Null backfill
Selected fields missing from the resolver result are backfilled with
null, matching the standard Yoga schema behavior.
##### Integration test
A new test runs the same findMany query (with __typename at all
structural levels) through both paths — standard Yoga schema and direct
execution — and asserts identical output via toStrictEqual.
