start implementation on new architecture

sia/command.py

@@ -0,0 +1,25 @@
+from abc import ABC, abstractmethod
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from .working_memory import WorkingMemory
+    from .command_result import CommandResult
+
+class Command(ABC):
+    """
+    Abstract base class for all commands that can be executed on working memory.
+    Commands represent immediate actions that modify the system state.
+    """
+    
+    @abstractmethod
+    def execute(self, memory: 'WorkingMemory') -> 'CommandResult':
+        """
+        Execute the command on the given working memory.
+        
+        Args:
+            memory: WorkingMemory instance to execute command on
+            
+        Returns:
+            CommandResult: Result of command execution
+        """
+        pass