5. tomotok.core package

Legacy compatibility layer.

This package is deprecated and kept only so that old imports of the form tomotok.core.inversions, tomotok.core.geometry and tomotok.core.regularisations keep working after the namespace reorganisation that dropped the core prefix. It re-exports tomotok.geometry, tomotok.inversions and tomotok.regularisations and emits a DeprecationWarning on import. New code should import those packages directly instead of tomotok.core.