AgentPool.create_agent() injects only llm_gateway (v2 path) into
ConfigDrivenAgent and never sets the legacy _llm_client field. The
previous _handle_llm_generate implementation gated the entire LLM
call on `self._llm_client is None`, so every expert/board agent
created via the pool silently fell through to the
`llm_generate_no_client` placeholder — which is why the private
board moderator/experts reported "LLM 不可用" even when the gateway
and providers were healthy.
Mirror the same precedence used by `_handle_direct`: prefer
`_llm_gateway` (with agent_name/task_type for usage tracking), fall
back to `_llm_client` for backward compatibility, and only return
the no-client placeholder when both are unavailable.
Add a unit test that constructs an agent with `llm_gateway` only
(_llm_client is None) and asserts the gateway.chat path is taken.
Chiguyong
chiguyong