start implementation on new architecture

sia/web_io_buffer.py

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+class WebIOBuffer:
+    """
+    IOBuffer implementation for web interface communication.
+    
+    This class manages input/output through memory buffers instead of system IO,
+    allowing for asynchronous communication through a web interface. It maintains
+    separate buffers for stdin and stdout to simulate bidirectional communication.
+    """
+    
+    def __init__(self):
+        """Initialize empty input and output buffers."""
+        self._stdin_buffer = ""
+        self._stdout_buffer = ""
+        
+    def read(self) -> str:
+        """
+        Read and clear all available input from the stdin buffer.
+        
+        Returns:
+            str: Content from the stdin buffer, or empty string if buffer is empty
+        """
+        content = self._stdin_buffer
+        self._stdin_buffer = ""
+        return content
+        
+    def write(self, content: str) -> None:
+        """
+        Append content to the stdout buffer.
+        
+        Args:
+            content: String content to append to the buffer
+        """
+        if content:
+            self._stdout_buffer += content
+            
+    def buffer_length(self) -> int:
+        """
+        Get the current length of the stdin buffer.
+        
+        Returns:
+            int: Number of characters in the stdin buffer
+        """
+        return len(self._stdin_buffer)
+        
+    def append_stdin(self, content: str) -> None:
+        """
+        Append content to the stdin buffer.
+        
+        Args:
+            content: String content to append to the stdin buffer
+        """
+        if content:
+            self._stdin_buffer += content
+            
+    def get_stdout(self) -> str:
+        """
+        Get the current content of the stdout buffer.
+        
+        Returns:
+            str: Current content of the stdout buffer
+        """
+        return self._stdout_buffer
+        
+    def clear_stdout(self) -> None:
+        """Clear the stdout buffer."""
+        self._stdout_buffer = ""