Agents that `send(to: "operator")` were easy to miss — they only
surfaced on the FL0W firehose with no read-state (#1469). Surface them
on the Y3R C4LL ("things waiting on you") tab as a proper inbox.
Backend:
- broker: `unread_for_recipient(recipient, limit)` — unacked messages
for a recipient, newest-first. Mirrors `mark_all_read`'s filter
EXACTLY (`recipient = ?1 AND acked_at IS NULL`, no `delivered_at`
condition) so everything listed is exactly what mark-read clears —
operator rows never get `delivered_at` set (no agent-socket recv).
- dashboard: `GET /api/operator-inbox` → `{ messages: [...] }` (id,
from, body, at, in_reply_to, validated file_refs). Mark-read reuses
the existing `POST /api/agent/operator/mark-all-read` (the route
format-validates the name; "operator" passes; `mark_all_read`
already acks `to="operator"` rows).
Frontend (Y3R C4LL):
- New ◆ 1NB0X ◆ section listing unread messages (sender · time · body,
path-linkified) + a "✓ mark all read" button.
- Cold-loaded on page load + on tab activation; appended live from the
broker `sent` stream (deduped on row id); cleared on mark-all-read.
- Unread count folds into the Y3R C4LL tab pill + the browser-title
`(N)` prefix, so messages are visible from any tab.
Removing the now-redundant FL0W operator-inbox UI is a clean follow-up
(deferred to avoid a flow.js conflict with the in-flight #1473).
Backend (broker + route) is host-side — @damocles to review per plan.
Closes#1469.
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