config: increase max_steps limit from 20 to 999999

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

agents/collab_runner.py

@@ -20,7 +20,7 @@ logger = logging.getLogger(__name__)
 
 @dataclass
 class CollaborativeTaskRunnerConfig:
-    max_steps: int = 20
+    max_steps: int = 999999
     max_recovery_attempts: int = 3
 
 

runtime/task.py

@@ -33,7 +33,7 @@ logger = logging.getLogger(__name__)
 
 @dataclass
 class TaskRunnerConfig:
-    max_steps: int = 20
+    max_steps: int = 999999
 
 
 Observer = Callable[[str], Scene]

storage/device_config.py

@@ -6,7 +6,7 @@ from pathlib import Path
 from typing import Any
 
 
-DEFAULT_MAX_STEPS = 20
+DEFAULT_MAX_STEPS = 999999
 
 
 class DeviceConfigStore: