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dsh-reasoning-only-guard

Keeps one reasoning-only turn from making an entire session unusable. When a turn produces no visible text and no tool call, the assistant message is persisted empty, the gateway then rejects every later request in that session with 'content or tool_calls must be set', and the session is dead with no way back through chat. This plugin registers a single llm/stream waterfall listener and, only when the turn carried nothing visible, injects a small text block immediately before the terminal finish, so the persisted message is never empty. Ships the fixture DSH's own mock cannot express (a strictly reasoning-only SSE server, since llm-mock-server forbids an empty successText and always appends text after reasoning), plus an end-to-end reproduction that replays a real persisted session through DSH's own serializeMessages. Preventive, not a repair. Zero dependencies, one file, no process or filesystem access.

防止「只有推理、没有正文」的一轮把整个会话变成不可用。某一轮没有可见文本也没有 tool-call 时，assistant 消息会以空内容落盘，此后该会话的每一次请求都会被网关以 "content or tool_calls must be set" 拒绝，会话彻底死亡且无法再从对话里找回。本插件只注册一个 llm/stream waterfall 监听器，且仅当这一轮没有任何可见产出时，在终止 finish 之前注入一小段文本，使落盘消息永远不为空。附带 DSH 自带 mock 造不出的夹具（严格只有推理的 SSE 服务，因为 llm-mock-server 不允许空 successText，且 reasoning_success 总会再补一段正文），以及把真实落盘会话经 DSH 自己的 serializeMessages 重放的端到端复现。属预防而非修复。零依赖、单文件、不访问进程与文件系统。