anti cb692d570a feat(cli): status queries systemd for every decnet-* unit ...

'decnet status' used to psutil-scan for cmdlines matching hand-coded
service launch args. That worked on dev boxes running workers via
'python -m decnet.cli ...' but missed the systemd reality on real
hosts: units may be installed but not started, failed, or in
auto-restart — all invisible to a cmdline grep.

New behaviour: status calls `systemctl list-units --type=service --all
--output=json 'decnet-*.service'` and renders the unit/load/active/
sub/description matrix. One view works for masters, agents, and
mixed hosts — iterates over whatever 'decnet-*' units were installed
by 'decnet init' / the enroll-bundle. Agent/master mode filtering is
no longer needed in the CLI; the host literally does not have
master-only units installed if it enrolled as an agent.

The psutil path survives as a fallback for boxes without systemd
(dev laptops, CI containers, minimal init systems) so the command
stays useful there. Clearly labelled 'psutil fallback' in the table
title so operators know which view they're looking at.

2026-04-24 00:23:00 -04:00

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