fix: loosen invalid API key test assertion to work across providers

chore: remove unused code

chore: fix black formatting guidance

refactor: drop dict-style result access

refactor: simplify clarification flow

refactor: remove unused clarification helpers

refactor: remove backend attribute proxy

refactor: remove unused max_retries config

docs: remove open deep research badge

docs: add ai compatibility badges

docs: add license and python badges

docs: add ci status badge

fix: allow initialization without api keys

fix: satisfy static type checks

chore: configure pylint for repo conventions