feat: add plugin runtime and cross-device task orchestration

artemis/agents/planner/planner.py

@@ -274,7 +274,7 @@ class PlannerNode:
                 screenshot_b64 = await controller.take_screenshot()
 
                 # Save to Data Engine if available to keep trace
-                if self.ctx.data_engine:
+                if self.ctx.data_engine and screenshot_b64:
                     img_bytes = base64.b64decode(screenshot_b64)
                     image_name = self.ctx.data_engine.get_or_create_image(img_bytes)
                     saved_path = str(self.ctx.data_engine.get_image_path(image_name))
@@ -284,7 +284,7 @@ class PlannerNode:
             except Exception as e:
                 logger.error(f"Failed to take screenshot for Initial Plan: {e}")
 
-        if not screenshot_b64:
+        if not screenshot_b64 and getattr(self.ctx, "execution_target", "android") != "computer":
             logger.error("Planner failed to obtain a screenshot.")
             raise ValueError("Planner failed to obtain a screenshot.")
 
@@ -296,6 +296,11 @@ class PlannerNode:
         human_message = Template(human_content).render(**render_kwargs)
 
         human_message_content = [{"type": "text", "text": human_message}]
+        if getattr(self.ctx, "execution_target", "android") == "computer":
+            screen = await UnifiedMobileController(self.ctx).get_screen_data()
+            human_message_content.append(
+                {"type": "text", "text": screen.observation_text + self.ctx.plugins.prompt()}
+            )
         if screenshot_b64:
             human_message_content.append(
                 {