Under the hood
Self-hosted runner now flags fatal-exit conditions before stopping on auth or repeated 404 poll failures
What
When the self-hosted runner's polling loop hits an authentication failure, or repeated 404 (not found) errors indicating its runner record no longer exists on the server, it now sets a flag marking the exit as fatal before breaking out of the loop.
Why
This makes it clearer, internally, when the runner stopped because of an unrecoverable problem rather than a normal shutdown, which should help distinguish these failure cases in logs or exit handling.