n1qn1 6.0.1-14

As requested by CRAN, gcc-asan and valgrind
Make package thread-safe: convert global state to thread_local, remove static from local variables in Fortran-translated C code, add integer overflow guards, and fix memory leaks in the R callback wrappers.
Review all C integer types; confirmed existing types are correct given Fortran ABI constraints (int* required for Fortran INTEGER) and R’s INTEGER() returning int*.
Fix undefined behavior: add virtual destructor to EvalBase so deleting derived callback objects through a base pointer is well-defined.
Fix memory leak: validate n and nzm before allocating callback objects, preventing a leak when Rf_error is called on bad inputs.
Fix restart=TRUE: typo caused mode to remain 2 instead of being set to 3.
Fix assign=TRUE: wrong field name meant the compressed Hessian was never stored in the supplied environment.
Add tests for restart, assign, single-variable optimization, repeated calls, and input error conditions.

n1qn1 6.0.1-13

Make package thread-safe: convert global state to thread_local, remove static from local variables in Fortran-translated C code, add integer overflow guards, and fix memory leaks in the R callback wrappers.
Review all C integer types; confirmed existing types are correct given Fortran ABI constraints (int* required for Fortran INTEGER) and R’s INTEGER() returning int*.

Add non binary (function pointer) interface/api so that nlmixr2est will not have to be re submitted when changes to this package occur.