When only containerd.service was active, the HINT block still advised
the operator to disable both containerd.service and docker.service,
which is misleading and potentially dangerous on hosts where docker is
legitimately in use. Track per service warnings (CONTAINERD_WARN and
DOCKER_WARN) and build the HINT systemctl disable argument from the
services that actually fired.
Also guard the ANSI color escapes behind an 'is stderr a TTY' check so
log files (CI and reviewer captures) do not accumulate raw escape
sequences.
Assisted-By: Claude <noreply@anthropic.com>
Signed-off-by: Aleksei Sviridkin <f@lex.la>
e803ce77a7