"""
HHD subsystem package.

This package is intended to hold the refactored implementation currently living in
`orisys.HHD`. The old monolithic file can remain as a compatibility layer while code
is moved here gradually.

Suggested migration target:
- `api.py`       -> public `nHHD` class
- `grid.py`      -> `StructuredGrid`
- `config.py`    -> `MaskedPoissonConfig`
- `domain.py`    -> `MaskedDomain`
- `poisson.py`   -> `PoissonSolver` facade
- `solvers/`     -> rectangular, masked sparse, capacitance FFT solvers
- `timing.py`    -> `Timer`
- `kernels.py`   -> helper kernels / backend-specific math
"""
from .api import nHHD
from .grid import StructuredGrid
from .poisson import PoissonSolver
from .timing import Timer

__all__ = ["PoissonSolver", "StructuredGrid", "Timer", "nHHD"]