- Replaced legacy typing (Optional, List, Type, Union, Tuple) with PEP 604/585 equivalents. - Added pyproject.toml with configurations for hatch-vcs, mypy, ruff, and codespell. - Added CI workflows for formatting, linting, type checking, and spelling. - Added CD workflow for building and uploading plugin artifacts on push to master and version tags. - Added dependency auditing workflow with pip-audit. - Added comprehensive docstrings and inline comments across all modules. - Fixed User-Agent header using hardcoded version instead of actual plugin version. - Fixed grammar and terminology in log messages and comments. - Removed unreachable error handling branch in unsubscribe command.