start implementation on new architecture

sia/standard_io_buffer.py

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+import sys
+
+class StandardIOBuffer:
+    """
+    IOBuffer implementation that uses system standard input/output.
+    
+    This class provides direct access to stdin/stdout for IO operations.
+    It implements a basic line-based input buffer to handle cases where
+    multiple reads are needed to process all available input.
+    """
+    
+    def __init__(self):
+        """Initialize the standard IO buffer."""
+        self._input_buffer: str = ""
+
+    def read(self) -> str:
+        """
+        Read available input from stdin.
+        
+        If there is buffered input from a previous read, return that first.
+        Otherwise, try to read new input from stdin if available.
+        
+        Returns:
+            str: Content read from stdin, or empty string if no input available
+        """
+        # Return and clear any existing buffered input
+        if self._input_buffer:
+            content = self._input_buffer
+            self._input_buffer = ""
+            return content
+            
+        # Check if there's input available
+        if not sys.stdin.isatty() and sys.stdin.readable():
+            try:
+                content = sys.stdin.read()
+                if content:
+                    return content
+            except Exception:
+                pass  # Ignore any read errors
+                
+        return ""
+        
+    def write(self, content: str) -> None:
+        """
+        Write content to stdout.
+        
+        Args:
+            content: String content to write
+        """
+        if not content:
+            return
+            
+        try:
+            sys.stdout.write(content)
+            sys.stdout.flush()
+        except Exception:
+            pass  # Ignore write errors
+            
+    def buffer_length(self) -> int:
+        """
+        Get the current length of buffered input.
+        
+        Returns:
+            int: Number of characters in the input buffer
+        """
+        return len(self._input_buffer)