Fixed stdin buffer length in context

sia/system_metrics.py

@@ -69,7 +69,7 @@ class SystemMetrics:
                     
             time.sleep(self._sample_interval)
 
-    def generate_context(self, context_usage: float) -> ET.Element:
+    def generate_context(self, context_usage: float, stdin_buffer_length: int) -> ET.Element:
         """
         Generate XML context element with current system metrics.
         Clears usage samples after generating averages.
@@ -112,7 +112,7 @@ class SystemMetrics:
         context.set("context_usage", str(round(context_usage * 100)))
         
         # Standard input buffer size 
-        context.set("stdin", "0")  # Set by agent
+        context.set("stdin", stdin_buffer_length)
         
         return context