installDockerNetwork errored with 'network with name <x> already exists'
on re-runs: the requirement check sets DOCKER_NETWORK_SETUP_NEEDED=true
whenever 'docker network inspect' returns non-zero, but that also happens
when the rootless daemon socket isn't reachable yet — indistinguishable
from the network being genuinely absent. A prior install also leaves the
network behind, so the flag fires on every re-install.
Re-check existence right before creating and converge: if the network is
already there, leave it in place and adopt its real subnet into CFG rather
than erroring. This also stops the spurious subnet randomization (and the
resulting CFG drift) that ran before the doomed create.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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