`slash.exec` runs on the RPC pool, outside any turn, so `/review` dispatched the
reviewer with no HERMES_UI_SESSION_ID and no steer authority bound. delegate_task
registered the child with `owner_session_id=None`, `subagent.list` (owner-scoped)
returned nothing for the parent session, and the Desktop status stack's 5s
snapshot poll reconciled the live `subagent.start` row away — the user saw only
"Review started. Results will return here." with no subagent card.
Bind the same session identity a turn binds (`_set_session_context(...,
ui_session_id=sid)` + `_current_runtime_session_record`) around `start_review`,
and clear it after. The reviewer now registers under the parent sid with the
request transport as authority, so `subagent.list`, steer, stop and the Desktop
roster all see it.
Live repro (tui_gateway stdio, real OpenRouter reviewer):
before: registry owner_session_id=None, owner_transport=NoneType;
subagent.list -> {"subagents": []}
after: owner_session_id=<parent sid>, owner_transport=StdioTransport;
subagent.list -> [{"goal": "Review recent work", "status": "running", ...}]
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