A subagent's terminal opened directly showed nothing until the subagent
published again: the relay was a core subscription, though its rows sit
in term-sub-<agent> for 24 hours. It now goes through the agent route's
replay-then-tail, so it opens with the subagent's newest 100 rows and
resumes after Last-Event-ID.
- term_stream.rs: the replay takes a stream name and a filter subject
instead of an agent, and `replay_or_live` (replay, else the live core
subscription) is the one fn both routes call. When the filter is one of
several subjects in the stream, a fresh reader's consumer starts at the
oldest row and drops all but the newest REPLAY_ROWS it counts as
pending, since the stream's newest sequences may belong to sibling
subagents. A single-subject stream (term-main-<agent>) picks its start
with replay_start exactly as before. Tests for both subagent cases.
- subagent_term.rs: the relay calls replay_or_live on the subagent's
subject in term-sub-<agent> and reads Last-Event-ID; module doc and
OpenAPI text no longer say "live only".
- main.rs: the handler test passes the new headers argument.
- swarm-queue-client agent_term.rs: replay_consumer_config takes the
filter subject instead of the agent.
- swarm-queue-client subagent_term.rs: consumer_create_grant, the
extended CONSUMER.CREATE form with a subagent subject as filter.
- swarm-nats-auth policy.rs: the controller holds that grant; the agent
grant's `$SWARM.term.*` filter is two tokens short of a subagent
subject, and the test that refused it now admits it.
- docs/swarm/ui.md, README.md: a subagent terminal opens with its newest
rows.
Fixes#5527
d9c586ef94