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, 8 insertions, 9 deletions

diff --git a/packages/meshbay-node/tests/test_indexer.py b/packages/meshbay-node/tests/test_indexer.py
index 6aee1b5..48bf399 100644
--- a/packages/meshbay-node/tests/test_indexer.py
+++ b/packages/meshbay-node/tests/test_indexer.py
@@ -4,16 +4,15 @@ import asyncio
 import os
 import threading
 import time
-import pytest
 from pathlib import Path
-from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PrivateKey
-from cryptography.hazmat.primitives.asymmetric.x25519 import X25519PrivateKey
 
+import meshbay_node.indexer.indexer as indexer_mod
+import pytest
+from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PrivateKey
 from meshbay_common.crypto import generate_gek
 from meshbay_node.indexer import DirectoryIndexer, GroupIndex, IndexCache
-import meshbay_node.indexer.indexer as indexer_mod
+
 from conftest import one_root
-from meshbay_node.keystore import NodeKeys
 
 
 @pytest.fixture
@@ -741,7 +740,7 @@ def test_small_file_gets_hash_version_1(tmp_path):
 
 
 def test_large_file_gets_hash_version_2(tmp_path):
-    from meshbay_node.indexer.indexer import _scan_file, _PARTIAL_THRESHOLD
+    from meshbay_node.indexer.indexer import _PARTIAL_THRESHOLD, _scan_file
     d = tmp_path / "root"
     d.mkdir()
     f = d / "big.mkv"
@@ -755,7 +754,7 @@ def test_large_file_gets_hash_version_2(tmp_path):
 
 
 def test_file_at_threshold_gets_hash_version_1(tmp_path):
-    from meshbay_node.indexer.indexer import _scan_file, _PARTIAL_THRESHOLD
+    from meshbay_node.indexer.indexer import _PARTIAL_THRESHOLD, _scan_file
     d = tmp_path / "root"
     d.mkdir()
     f = d / "exact.mkv"
@@ -770,7 +769,7 @@ def test_partial_hash_differs_from_full_hash(tmp_path):
     """For a file above the threshold, the partial hash must differ from what
     a full-file blake3 would produce (they read different bytes)."""
     import blake3 as b3
-    from meshbay_node.indexer.indexer import _scan_file, _PARTIAL_THRESHOLD
+    from meshbay_node.indexer.indexer import _PARTIAL_THRESHOLD, _scan_file
     d = tmp_path / "root"
     d.mkdir()
     f = d / "big.mkv"
@@ -785,7 +784,7 @@ def test_partial_hash_differs_from_full_hash(tmp_path):
 
 
 def test_partial_hash_is_deterministic(tmp_path):
-    from meshbay_node.indexer.indexer import _scan_file, _PARTIAL_THRESHOLD
+    from meshbay_node.indexer.indexer import _PARTIAL_THRESHOLD, _scan_file
     d = tmp_path / "root"
     d.mkdir()
     f = d / "big.mkv"