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
The /feedback acknowledgement now appends a sharing-policy sentence after the
anonymous user id. The seeded-history e2e regex anchored on the end of the
User line, and the golden snapshot did not include the disclosure. Update both
to match the new format, and re-record the module-graph translation-pairing
hash after rebasing onto master (which picked up the windows-native ACL
coverage fix in #2182).
