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Change ACTIONS_RUNNER_USE_KUBE_SCHEDULER to ACTIONS_RUNNER_DISABLE_KUBE_SCHEDULER to make affinity-based scheduling the first-class (default) implementation. Breaking Change: - OLD: Set ACTIONS_RUNNER_USE_KUBE_SCHEDULER=true to enable affinity (opt-in) - NEW: Affinity is enabled by default, set ACTIONS_RUNNER_DISABLE_KUBE_SCHEDULER=true to disable (opt-out) Code changes: - utils.ts: Rename constant and invert useKubeScheduler() logic - rwo-affinity-test.ts: Update tests to verify default affinity behavior - ADR 0135: Update to reflect opt-out model - README: Update guidance to reflect default behavior Co-authored-by: Sisyphus <sisyphus@ohmyopencode.com>