- Added a section in README.md to clarify the requirement of an existing asyncio event loop for using TSignal's decorators.
- Updated the api.md to emphasize the need for a running event loop when using the @t_with_signals and @t_slot decorators.
- Clarified that if no event loop is running, a RuntimeError will be raised.

Modified the core.py
- Logs and raises an error message instead of creating a new event loop when none is found.

Update version
- Incremented the version number in pyproject.toml from 0.4.2 to  0.4.3.