- Added a new script entry point `astrbot-sdk` in `pyproject.toml`.
- Introduced `has_waiter` method in `SessionWaiterManager` to check for existing waiters.
- Updated `cli.py` to improve error handling and added context to error messages.
- Implemented local development support in `cli.py` with a new `dev` command for running plugins against a mock core.
- Created a new testing module `astrbot_sdk.testing` with utilities for local development and plugin testing.
- Added comprehensive tests for the new testing module and CLI commands.
- Improved compatibility and error messaging for plugin loading failures.
