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MiMo and DeepSeek V3.2/V4 reject multi-turn requests in thinking mode when the prior assistant message lacks reasoning_content with HTTP 400: "The reasoning_content in the thinking mode must be passed back to the API." Agent's ReAct loop is the worst-case scenario — every round produces tool calls, exactly the case DeepSeek's docs specify reasoning_content MUST participate in subsequent context. Plumb reasoning_content through the full assistant-message round-trip: - chat.Message / types.ChatResponse / types.AgentStep gain a reasoning_content field (AgentStep persists via the existing Message.AgentSteps jsonb column, no migration needed). - streamLLMToEventBus accumulates reasoning chunks into result.ReasoningContent and surfaces it on the round's ChatResponse. - engine.runReActIteration writes it onto AgentStep so cross-turn replay preserves it. - observe.appendToolResults attaches it to the same-turn assistant message; agent_history.buildAssistantHistoryMessages does the same on cross-turn replay. - RemoteAPIChat.ConvertMessages forwards it on assistant turns to openai.ChatCompletionMessage.ReasoningContent (already supported by go-openai); providers that don't recognize the field ignore it. Tests cover the three boundaries: ConvertMessages serializes it for upstream, appendToolResults preserves it within the same turn, and buildAssistantHistoryMessages replays it across turns. Scope is intentionally limited to Agent mode — KnowledgeQA's chat pipeline and Anthropic's signed thinking_blocks are separate fixes that require schema changes (rendered_content / thinking_blocks columns). Fixes #1302