Some OpenAI-compatible gateways fronting Gemini backends emit the native
uppercase finish reasons (STOP, MAX_TOKENS) instead of the lowercase
OpenAI contract values. Every downstream comparison in Hermes uses
lowercase literals, so an uppercase reason silently fell through: a
clean STOP completion missed the stop handling and a MAX_TOKENS
truncation never entered the length-recovery path.
Adds normalize_finish_reason() as the single owner in
agent/message_sanitization.py (case fold + alias map: max_tokens->length,
end->stop, function_call->tool_calls) and wires it at both wire-intake
choke points: ChatCompletionsTransport.normalize_response and the
streaming chunk-capture loop in chat_completion_helpers. Non-string and
empty values pass through unchanged so existing 'or "stop"' defaults
and the Poolside int-reason path keep their behavior.
Hermes Agent
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