Import leader-change error codes from dqlitewire

The 10250/10506 magic-number tuple used by DqliteConnection to decide
whether a protocol error means "invalidate and reconnect" is now owned
by dqlitewire.constants. Drop the local definition and re-import.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: antoineleclair

src/dqliteclient/connection.py

@@ -18,13 +18,9 @@
     DqliteProtocol,
     _validate_positive_int_or_none,
 )
+from dqlitewire import LEADER_ERROR_CODES as _LEADER_ERROR_CODES
 from dqlitewire.exceptions import EncodeError as _WireEncodeError
 
-# dqlite error codes that indicate a leader change (SQLite extended error codes)
-# SQLITE_IOERR_NOT_LEADER = SQLITE_IOERR | (40 << 8) = 10250
-# SQLITE_IOERR_LEADERSHIP_LOST = SQLITE_IOERR | (41 << 8) = 10506
-_LEADER_ERROR_CODES = {10250, 10506}
-
 
 def _parse_address(address: str) -> tuple[str, int]:
     """Parse a host:port address string, handling IPv6 brackets."""