Cover the reachable controller and control branches: each failure code's
copy, dispose-during-flight, non-Error rejections, and non-conflict
mutation failures.
Two paths were unreachable rather than untested, so remove them instead:
commit() cannot run after disposal because mutate() refuses admission
first, and the mutation tail cannot reject because every queued operation
settles as a result. Pass the recorded rating into the note save so the
editor's render site proves it exists.
Consume the durable message-feedback sidecar from #2217 in the browser:
per-message Like/Dislike with an optional note, contributed through a
declared assistant-actions slot.
- carry MessageId on finalized AssistantMessageNode so a target is nameable
- declare conversation.chat.assistant-actions and render it in the
IconActions row between copy and branch
- hold one FeedbackController per Session with per-item ifVersion CAS,
reconciling a version-conflict from the reply's authoritative item
- mount messageFeedbackRemote alongside goalsRemote
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