Squash-merge lib-standardisation: adopt repo standards across packaging,
tooling, docs, and CI.
- standardize pyproject.toml (canonical packaging, lint config, extras, GSDFC pydoclint)
- add py.typed marker, modernize type hints and Google-style docstrings
- nest generated docs under docs/lib and docs/mcp; add hand-written wiki
- adopt standard Type A PyPI CI pipeline (tag==version guard + quality gate)
- promote generated CHANGELOG.md; bump version to 0.0.3
- Add generic CredentialStore abstraction for credential persistence
- Introduce pickle- and Redis-backed credential store implementations
- Refactor Google OAuth provider to delegate persistence to CredentialStore
- Make auth providers generic over credential type for stricter contracts
- Update package documentation to reflect credential lifecycle vs persistence split
- Add credentials module to public API surface
- Harden .gitignore to exclude credential and token artifacts
This release removes node-local persistence assumptions, enables
distributed-safe authentication, and formalizes credential storage as
a first-class extension point.
