Non-streaming /v1/chat/completions wrapped any AIAgent result \u2014 including
partial/failed runs \u2014 as a successful 200 with finish_reason='stop' and
the internal failure string substituted into message.content. API
clients had no way to distinguish 'agent answered: X' from
'agent crashed and the X you see is its error message'.
After the fix:
- completed: True \u2192 200 finish_reason='stop' (unchanged)
- partial + truncated text \u2192 200 finish_reason='length' + hermes extras
- partial + no text / failed \u2192 502 OpenAI error envelope (SDKs raise)
- other failures \u2192 200 finish_reason='error' + hermes extras
Adds X-Hermes-Completed / X-Hermes-Partial / X-Hermes-Error headers
plus a 'hermes' extras object on partial responses for clients that
want the full picture.
Closes#22496.
2124ad72a2