refactor: deduplicate warning log in oversized message handler

Merge the two except branches (LimitOverrunError, ValueError) into one,
using isinstance() to gate the re-raise check for unrelated ValueErrors.
Eliminates the duplicated 5-line logging.warning() call.

Author: koriyoshi2041

src/acp/connection.py

@@ -150,26 +150,16 @@ async def _receive_loop(self) -> None:
             while True:
                 try:
                     line = await self._reader.readline()
-                except asyncio.LimitOverrunError as exc:
+                except (asyncio.LimitOverrunError, ValueError) as exc:
                     # The message exceeded the StreamReader's buffer limit.
-                    # On Python < 3.12 the raw LimitOverrunError propagates.
-                    logging.warning(
-                        "Skipped oversized JSON-RPC message that exceeded the "
-                        "StreamReader buffer limit: %s. The connection will "
-                        "continue processing subsequent messages. Consider "
-                        "increasing the buffer limit via stdio_buffer_limit_bytes "
-                        "if large messages are expected.",
-                        exc,
-                    )
-                    continue
-                except ValueError as exc:
                     # Python 3.12+ wraps LimitOverrunError as ValueError inside
-                    # readline(), and cleans up the internal buffer.  Re-raise
-                    # if this ValueError is NOT the limit-overrun wrapper so we
-                    # don't accidentally mask unrelated errors.
-                    exc_msg = str(exc).lower()
-                    if "limit" not in exc_msg and "chunk" not in exc_msg:
-                        raise
+                    # readline(); older versions raise LimitOverrunError directly.
+                    # Re-raise ValueErrors that are NOT the limit-overrun wrapper
+                    # so we don't accidentally mask unrelated errors.
+                    if isinstance(exc, ValueError):
+                        exc_msg = str(exc).lower()
+                        if "limit" not in exc_msg and "chunk" not in exc_msg:
+                            raise
                     logging.warning(
                         "Skipped oversized JSON-RPC message that exceeded the "
                         "StreamReader buffer limit: %s. The connection will "