style: ruff's own fixes, mechanically applied

`ruff check .` had gone unrun long enough to report 568 errors, which is the
same as having no linter: the next real finding would have been invisible in the
noise. This is the 521 it fixes by itself, in 173 files, and nothing else — the
98 it cannot fix are the next commit.

What actually changed: import sorting (225), imports nobody used (87, none of
them a re-export — no `__init__.py` is touched, which was the one way this could
have broken an import elsewhere), `datetime.timezone.utc` to `datetime.UTC` (69)
and `asyncio.TimeoutError` to `TimeoutError` (18), both plain aliases on the 3.12
this project requires, `Optional[X]` to `X | None` (24), and f-strings with
nothing to interpolate (19).

Checked rather than assumed: every module in the three packages still imports,
and the suite is 2893 passed — the same count, test for test, as the merge
before it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

1 files changed, 4 insertions, 6 deletions

diff --git a/packages/meshbay-node/tests/test_hot_reload_survives_client_close.py b/packages/meshbay-node/tests/test_hot_reload_survives_client_close.py
index fc6af70..fb9eade 100644
--- a/packages/meshbay-node/tests/test_hot_reload_survives_client_close.py
+++ b/packages/meshbay-node/tests/test_hot_reload_survives_client_close.py
@@ -18,17 +18,15 @@ import asyncio
 import base64
 import os
 from pathlib import Path
+from unittest.mock import AsyncMock, MagicMock, patch
 
+import meshbay_node.indexer.indexer as indexer_mod
 import pytest
 from cryptography.hazmat.primitives import serialization
 from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PrivateKey
 from cryptography.hazmat.primitives.asymmetric.x25519 import X25519PrivateKey
-from unittest.mock import AsyncMock, MagicMock, patch
-
 from meshbay_node import ops
-from meshbay_node.config import Config, HubConfig, NodeConfig, GroupConfig, KeystoreConfig
 from meshbay_node.daemon import NodeDaemon
-import meshbay_node.indexer.indexer as indexer_mod
 
 
 def _free_port() -> int:
@@ -149,7 +147,7 @@ async def test_hot_loaded_group_finishes_scanning_without_anyone_awaiting_the_re
             with patch("signal.SIGINT", 2), patch("signal.SIGTERM", 15):
                 try:
                     await asyncio.wait_for(daemon.run(), timeout=15)
-                except (asyncio.TimeoutError, Exception):
+                except (TimeoutError, Exception):
                     pass
 
         run_task = asyncio.create_task(run_daemon())
@@ -270,7 +268,7 @@ async def test_group_scoped_ops_404_until_listed_then_succeed(tmp_path):
             with patch("signal.SIGINT", 2), patch("signal.SIGTERM", 15):
                 try:
                     await asyncio.wait_for(daemon.run(), timeout=15)
-                except (asyncio.TimeoutError, Exception):
+                except (TimeoutError, Exception):
                     pass
 
         run_task = asyncio.create_task(run_daemon())