Rename simmit module and cleanup legacy naming

[kmarchais]

Background

The Python bindings currently use legacy naming from when the project used Boost.Python:

• The C++ module is named simmit (compiled to simmit.cpython-xxx.so)
• The main wrapper file is named boostpython_smartplus_wrappers.cpp despite using pybind11
• Users import via import simcoon, which internally does from simcoon.simmit import *

Proposed Changes

1. Rename the C++ module from simmit to _core

Following Python conventions, internal C extension modules are typically prefixed with _:

• simmit.cpython-xxx.so → _core.cpython-xxx.so

Files to modify:

• simcoon-python-builder/CMakeLists.txt: Change pybind11_add_module(simmit ...) to pybind11_add_module(_core ...)
• python-setup/simcoon/__init__.py: Change from simcoon.simmit import * to from simcoon._core import *

2. Rename the wrapper source file

• simcoon-python-builder/src/python_wrappers/boostpython_smartplus_wrappers.cpp → python_module.cpp

Files to modify:

• simcoon-python-builder/CMakeLists.txt: Update source file path

3. Update PYBIND11_MODULE declaration

In the wrapper file, update the module name:

// Before
PYBIND11_MODULE(simmit, m) {

// After  
PYBIND11_MODULE(_core, m) {

Import behavior (unchanged)

Users will continue to use:

import simcoon
simcoon.L_iso(...)

The internal module name (_core vs simmit) is an implementation detail not exposed to users.

Checklist

• Rename boostpython_smartplus_wrappers.cpp to python_module.cpp
• Rename CMake target from simmit to _core
• Update PYBIND11_MODULE(simmit, m) to PYBIND11_MODULE(_core, m)
• Update __init__.py import
• Update any documentation references
• Test that import simcoon still works