Python 3.14 changed asyncio.get_event_loop() to raise RuntimeError when
no running event loop exists instead of silently creating one. This broke
all async code paths that relied on get_event_loop().
Changes:
- Replace asyncio.get_event_loop() with asyncio.get_running_loop() in all
async contexts across crewai core and crewai-tools
- Update requires-python from '<3.14' to '<3.15' in all pyproject.toml files
- Add comprehensive tests for Python 3.14 async compatibility
- Regenerate uv.lock for the updated version constraint
Closes#5109
Co-Authored-By: João <joao@crewai.com>
