Stable hybrid (pixi+conda)

This release maintains compatibility with existing Conda workflows by preserving the legacy conda-build setup for building Conda packages. Meanwhile, PyPI packaging is fully handled through the new Pixi-based build system.

• PyPI package: built via Pixi tasks using pyproject.toml

• Conda package: built using traditional conda-build (meta.yaml)

• Both systems coexist to support transition and compatibility needs