Expert workspace observation and correction

Current contract: ADR-046

The former Expert Queue was a pre-delivery gate driven by confidence, risk, review flags, auto-reply settings, clarification parsing, and approval state. That delivery model is retired.

A successful Hermes reply is persisted canonically and delivered exactly once without waiting for an Expert. Ordinary successful delivery does not create an Expert work item. The workspace may show an explicit human request, a genuine runtime failure, or a conversation an authorized Expert intentionally opens for correction/follow-up. None of those records may set held_for_review, waiting_approval, suppress a reply, or manufacture a substitute reply.

An Expert correction must update the exact canonical Hermes SessionDB locator, or append one canonical assistant row when the text is genuinely human-authored and no Hermes row exists. Retries are idempotent at that write boundary.

The deleted confidence-threshold routing, review-release, approval-continuation, and draft-queue behavior remains only in Git history.