fix: hide stty resize command from terminal output using ANSI escapes

apps/api/src/services/terminal_session.py

@@ -155,7 +155,13 @@ class TerminalSession:
         # Docker exec doesn't forward PTY resize to the container process,
         # so we need to explicitly set the size inside the container shell.
         # Send on every resize so the container shell always matches the frontend.
-        stty_cmd = f"stty cols {cols} rows {rows}\n".encode()
+        # Use ANSI escape sequences to hide the command from view:
+        # - \x1b[?25l: hide cursor
+        # - \x1b[A\x1b[2K: move up and clear line
+        # - \x1b[?25h: show cursor
+        stty_cmd = (
+            f"\x1b[?25lstty cols {cols} rows {rows}\n\x1b[A\x1b[2K\x1b[?25h"
+        ).encode()
         await self.write_input(stty_cmd)
         logger.debug(f"Sent stty resize to container for session {self.session_id}: {cols}x{rows}")