docs(libSceNpTus): record the single-source shadPS4 signatures of the declared stubs

docs/dev/debt/libSceNpTus.md

@@ -2,6 +2,7 @@
 
 ### Unknown function info
 
+- [sceNpTusCreateNpTitleCtx](../../../core/libs/prx/libSceNpTus/Export.cpp) - throws through `NotImplemented_nid_no_patch`; behaviour and the PS5 prototypes are unmeasured. The only source of the parameter lists is shadPS4's PS4-derived prototypes (GPLv2, used as a reference only), with no second reference; structure pointers are `void*` because no layout is known.
 - [TUS variable outputs](../../../core/libs/prx/libSceNpTus/Export.cpp) (libSceNpTus) - the layouts of the variable arrays of the `sceNpTusGetMultiSlotVariable*` calls and of `outVariable` in `sceNpTusAddAndGetVariableAAsync` are not verified, so the output is never written and `variableArraySize` / `outVariableSize` are not checked; shadPS4, and RPCS3 in its PS3 `sceNpTusGetMultiSlotVariable*` and `sceNpTusAddAndGetVariable*` calls, return `INVALID_ALIGNMENT` unless the size is `arrayLen` variables of the call's type, or one variable for `outVariable`. The signatures and the community error codes follow [shadPS4](https://github.com/shadps4-emu/shadPS4/tree/main/src/core/libraries/np/np_tus), which fpPS4 agrees with for the context and request calls; no console measurement.
 - [Multi-slot variable calls](../../../core/libs/prx/libSceNpTus/Export.cpp) (libSceNpTus) - the argument checks of the multi-slot get, set and delete calls are not measured on a console; they follow [shadPS4](https://github.com/shadps4-emu/shadPS4/blob/c1b26558352b863f80142256e4df38585aa7d727/src/core/libraries/np/np_tus/np_tus.cpp), where they differ between functions: `arrayLen < 1` is `INSUFFICIENT_ARGUMENT` in the NpId and virtual-user delete calls and in `sceNpTusGetMultiSlotVariableVUserAsync`, and `INVALID_ARGUMENT` in the others; a null NpId is accepted except in delete; an empty virtual user ID is `INVALID_ARGUMENT`. RPCS3's [PS3 module](https://github.com/RPCS3/rpcs3/blob/1a9dca3a3a84a18df866e3021918322bd295160a/rpcs3/Emu/Cell/Modules/sceNpTus.cpp) has only the NpId and virtual-user calls; it returns `INVALID_ARGUMENT` for an empty array in all of them, rejects a null target in get and set and does not check for an empty virtual user ID.
 - [Variable, data, data status and TSS requests](../../../core/libs/prx/libSceNpTus/Export.cpp) (libSceNpTus) - the argument checks of the 82 add-and-get, try-and-set, data, data status, multi-user, friends and `sceNpTssGetSmallStorage` calls are not measured on a console; their signatures, checks and order follow [shadPS4](https://github.com/shadps4-emu/shadPS4/blob/a808e76/src/core/libraries/np/np_tus/np_tus.cpp), including its differences between forms: the NpId try-and-set calls return `INVALID_ARGUMENT` for an operation type outside 1-6 where the others return `INVALID_TYPE`, and the NpId and virtual-user multi-slot data status calls return `TOO_MANY_NPID` for more than 64 slots. As for the calls above, the output and structure sizes are not checked, and every request finishes with `SCE_NP_ERROR_SIGNED_OUT`