Improved the system prompt

sia/system_metrics.py

@@ -109,7 +109,7 @@ class SystemMetrics:
         context.set("disk_total", str(disk.total))
         
         # Context usage (0-100)
-        context.set("context", str(round(context_usage * 100)))
+        context.set("context_usage", str(round(context_usage * 100)))
         
         # Standard input buffer size 
         context.set("stdin", "0")  # Set by agent
@@ -119,4 +119,4 @@ class SystemMetrics:
     def stop(self):
         """Stop the monitoring thread and clean up."""
         self._stop_event.set()
-        self._monitor_thread.join()
+        self._monitor_thread.join()