Client UI Message Feedback

Per-message feedback plugin, browser half: a Like/Dislike pair plus an optional note, contributed as the `feedback` entry (order 10) of the `conversation.chat.assistant-actions` strip. The strip is declared by `ui-conversation` and rendered inside the finalized assistant message's IconActions row, between copy and branch, so the controls inherit that row's chrome and hover behavior. The note editor itself does not sit in that row: it is a `role="dialog"` popover portaled to `document.body` and anchored under its trigger, so the row keeps its single line whether the editor is open or closed and the panel is not clipped by the conversation column. A rating or list-load failure shows inline in the row; a note-save failure shows inside the popover, which stays open so the draft can be corrected. Only finalized messages reach the slot — an interruption-frozen partial carries no `messageId` and therefore no feedback controls. The strip renders once per turn, on the closing assistant message that owns the turn's IconActions row: earlier steps of a multi-step turn produce tool rows rather than a rateable body, so they present no controls even though the Host would accept them as targets.

• 适用 Agent：DeepSeek Harness
• 适配模型：DeepSeek

@deepseek-ai/dsh-client-ui-message-feedback

暂无通过审核、可复现的同任务 A/B 运行证据；本档案仅证明来源可信，不代表实测有效。