Only post a severity classification comment when the bot hasn't
commented before or when the severity actually changed. Previously
every push (synchronize event) would post a new comment even if the
classification was identical.
The prompt now instructs the classifier to:
- Check for existing bot comments via the pr-severity-bot marker
- Compare the new severity against the existing severity label
- Skip commenting if both match, while still ensuring labels are correct
- Include a severity changed banner when re-commenting due to a change
Olaoluwa Osuntokun
0871193cdf