Remove the 20-step execution limit that was causing "max steps exceeded" errors for long-running tasks. Increase the default max_steps to 999999 in all configurations, effectively removing the practical limit while maintaining the safety mechanism.
Changes:
- runtime/task.py: TaskRunnerConfig.max_steps 20 → 999999
- agents/collab_runner.py: CollaborativeTaskRunnerConfig.max_steps 20 → 999999
- storage/device_config.py: DEFAULT_MAX_STEPS 20 → 999999