Dashboard AGENT log tab sent unit=hive-ag3nt.service (the crate/dir
name) but the actual systemd unit is hive-agent.service, so every
fetch 400'd against the backend allow-list. Fixed the dropdown value
and, per the same issue's request, added the other per-agent daemons
(hive-mcp-http, hive-bash-daemon, hive-matrix-daemon) as selectable
units, plus hive-priv.service on the SYSTEM tab's host-daemon list.
Extended both backend allow-lists (post_journal / post_journal_host)
to match, and fixed a stale systemd.services.hive-ag3nt doc reference
in agent-hierarchy.md that had the same crate/unit-name confusion.
a73216e8be