An agent's queue credential could subscribe to every subject in the swarm
account, so any agent could read every other agent's terminal, turn state,
operator input and request replies. Agents are the least trusted clients
on the queue (mara's ruling on #4901), so their grants now carry a
subscribe allow-list:
- an agent's own credential (the harness and its subagent daemon):
`_INBOX.agent.<agent>.>` and `$SWARM.input.<agent>`
- the hive's shared agent client: `_INBOX.client.<client-id>.>`
Hive and swarm-controller grants are unchanged (no `sub` claim, so still
every subject).
The clients connect with the matching inbox prefix, so the replies they
rely on still arrive: the icon write's JetStream ack and the schedule
DIRECT.GET. `connect_with_token` takes the agent name and sets the prefix
itself; the hive-shared fallback uses the new
`connect_with_inbox_prefix`.
The harness no longer subscribes to its input subject when it fell back
to the hive's shared client: that identity names no agent, so it cannot
be granted one agent's input without all of them. It logs that and
skips, the same as the schedule reader on that path.
Refs #4901
The agent view in the swarm UI gets a message box. The text reaches the
agent's harness straight from swarm-controller over the swarm queue and
becomes an inbox turn from the operator's authelia username. hive-c0re is
not in the path.
- gateway: `/api/` forwards authelia's `Remote-User`, replacing any the
client sent.
- swarm-controller: `POST /api/agents/{name}/input` takes that header as
the sender (401 without it) and sends `{from, body}` as a NATS request
on `$SWARM.input.<agent>`. No subscriber is a 503.
- swarm-nats-auth: the controller is granted publish on `$SWARM.input.*`;
no hive or agent grant names the family, so the harness can trust
`from`.
- hive-agent: a task subscribes to the agent's own input subject and
pushes each message into the serve loop's existing reminder channel,
renamed `local_msg_*` since it now carries both.
The harness does not reply to the request: no agent grant covers a reply
subject. The controller therefore answers 202 once the request times out
(2s) and 503 on the server's no-responders status.
Closes#4828
