[tkittel]

Yo @MilanKlausz we are finally getting to the dgcode_projects in this housekeeping + updating of simplebuild and dgcode.

It is mostly follow up fixes for the migration away from pybind11 to a new small custom python-c++ hooking I designed (it has less features but compiles a lot faster and will eventually allow me to drop the pybind11 support). There are also some fixes for one of your tests which was a bit flaky.

Claude will say the rest:

Converts all compiled Python modules from pybind11 (pycpp_* directories) to sbldpy (pymod_* directories), as introduced in simplebuild 2.0.0 and simplebuild-dgcode 2.0.0, and makes the output of the LOKI tests independent of the platform.

Python modules (the Python APIs are unchanged):

• The geometry modules GeoBCS, GeoBCSBanks, GeoLarmor2020, GeoLarmor2022 and GeoPlane are migrated following the recipe in the simplebuild-dgcode documentation.
• LokiAimHelper, Larmor2022Bank and G4GeoLokiTests.TestUtils: the compiled code is now in private modules, and Python modules with the same names add the default values of constructor arguments, the module constants, and the conversion of results to lists. G4GeoLokiTests now depends on numpy.

Test robustness:

• Many positions in the LOKI geometry (e.g. pixel centres along the straws, like 7.8125 mm) are exactly halfway between two printed values, so tiny floating point differences between platforms decided the rounding, and test_geo_navigation failed on macOS. The fmt helper of the tests now removes such differences before rounding, and always rounds ties away from zero. The reference logs change only in the last digit of such values (and in the hashes of formatted pixel centres in test_larmor2022_bank).

All 44 tests pass on Linux (release and debug builds) and macOS. The cppcheck step requires simplebuild-dgcode 2.0.1, which fixes an error reported in its MCPLExtra package.

assisted-by: claude