Apply ruff --fix (import ordering, SIM117 nested-with)

Extending linting to all four packages (run-tests.sh previously only
linted the wire package) surfaced a handful of style drift that had
accumulated unchecked. Auto-fixes applied.

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

Author: antoineleclair

src/dqliteclient/cluster.py

@@ -15,7 +15,6 @@
 from dqliteclient.protocol import DqliteProtocol
 from dqliteclient.retry import retry_with_backoff
 
-
 # Type alias for a redirect-target policy. Returns True if the address
 # should be accepted, False to reject with a ClusterError.
 RedirectPolicy = Callable[[str], bool]
@@ -67,9 +66,7 @@ def _check_redirect(self, address: str) -> None:
         if self._redirect_policy is None:
             return
         if not self._redirect_policy(address):
-            raise ClusterError(
-                f"Leader redirect to {address!r} rejected by redirect_policy"
-            )
+            raise ClusterError(f"Leader redirect to {address!r} rejected by redirect_policy")
 
     async def find_leader(self) -> str:
         """Find the current cluster leader.

src/dqliteclient/connection.py

@@ -116,9 +116,7 @@ def is_connected(self) -> bool:
 
     def __repr__(self) -> str:
         state = "connected" if self._protocol is not None else "disconnected"
-        return (
-            f"<DqliteConnection address={self._address!r} database={self._database!r} {state}>"
-        )
+        return f"<DqliteConnection address={self._address!r} database={self._database!r} {state}>"
 
     @property
     def in_transaction(self) -> bool:

tests/test_redirect_policy.py

@@ -38,9 +38,11 @@ def test_rejects_unknown_redirect(self) -> None:
             redirect_policy=allowlist_policy(["10.0.0.1:9001"]),
         )
         # A compromised peer redirects to an attacker-controlled host.
-        with patch.object(cc, "_query_leader", new=AsyncMock(return_value="attacker.com:9001")):
-            with pytest.raises(ClusterError, match="rejected"):
-                asyncio.run(cc.find_leader())
+        with (
+            patch.object(cc, "_query_leader", new=AsyncMock(return_value="attacker.com:9001")),
+            pytest.raises(ClusterError, match="rejected"),
+        ):
+            asyncio.run(cc.find_leader())
 
     def test_no_policy_means_any_redirect_accepted(self) -> None:
         """Default (None) policy preserves legacy behavior."""