sceNpTusCreateNpTitleCtx makes the same checks as sceNpTssCreateNpTitleCtx,
which already follows shadPS4's sceNpTusCreateNpTitleCtx: a null npId is
INSUFFICIENT_ARGUMENT, service label 0xFFFFFFFF is INVALID_ARGUMENT, and
otherwise it creates a context in the shared 32-context table. The
signature is shadPS4's and fpPS4's.
sceNpTssCreateNpTitleCtxA creates a context like sceNpTusCreateNpTitleCtxA,
and sceNpTssCreateNpTitleCtx checks its NpId and service label first, as
shadPS4 does; both share the TUS table, its 32-context limit and its
requests.
Titles that import libSceNpTus failed to load because the library did
not exist. Title contexts and requests are tracked, arguments are
validated, and every storage operation completes as signed out, matching
how libSceNpManager reports PSN.