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linux-runner.sh takes its packages from apt where there is no Nix, the registration token from RUNNER_TOKEN (a machine where gh must not be logged in), and RUNNER_CPUS / RUNNER_MEMORY for a machine that does nothing else. playhorizon, a partner's 8-thread server, joins parity_hosts.json. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>