The refresh_entities handler was a plain function, so Home Assistant ran it
in a worker thread, where writing entity state raises. It is now a callback,
run in the event loop, with no other change in behaviour.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01G6ujRpJUVzNCWbtidQyjPm