chemx-ext 0.3.0

External-program interfaces (xtb, CREST) and the RDKit-free fallback conformer generator for chemx.
Documentation

chemx-ext — interfaces to external programs (xtb, CREST) and the RDKit-free fallback conformer generator.

The subprocess wrappers never require the external binary at build or test time: the input writers and output parsers are pure functions tested against vendored fixture strings (see PROVENANCE.md for the format sources), and binary detection ([xtb::find_xtb], [crest::find_crest]) returns a named [ExtError::BinaryNotFound] with install guidance when the program is absent.