Hardening directives leave the base unit body and live in:
deploy/files/etc/systemd/system/left4me-web.service.d/10-hardening.conf
deploy/files/etc/systemd/system/left4me-server@.service.d/10-hardening.conf
Reference units now describe just the base operational shape (exec,
env, restart, resources). Tests split: base-unit content and hardening
profile are asserted separately.
Part of 2026-05-15-deployment-responsibility-design.md migration
step 2. ckn-bw lands the matching reactor surgery + symlink delivery.