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>

6 files changed, 22 insertions, 24 deletions

diff --git a/packages/meshbay-node/src/meshbay_node/indexer/__init__.py b/packages/meshbay-node/src/meshbay_node/indexer/__init__.py
index c92c730..a40e9f2 100644
--- a/packages/meshbay-node/src/meshbay_node/indexer/__init__.py
+++ b/packages/meshbay-node/src/meshbay_node/indexer/__init__.py
@@ -1,6 +1,6 @@
 """Directory indexer and Mesh Group Index."""
-from .indexer import DirectoryIndexer
-from .group_index import GroupIndex
 from .cache import IndexCache
+from .group_index import GroupIndex
+from .indexer import DirectoryIndexer
 
 __all__ = ["DirectoryIndexer", "GroupIndex", "IndexCache"]
diff --git a/packages/meshbay-node/src/meshbay_node/indexer/enrich.py b/packages/meshbay-node/src/meshbay_node/indexer/enrich.py
index b44a246..9881298 100644
--- a/packages/meshbay-node/src/meshbay_node/indexer/enrich.py
+++ b/packages/meshbay-node/src/meshbay_node/indexer/enrich.py
@@ -13,12 +13,12 @@ the rest asynchronously and hands the result back via a callback.
 
 import asyncio
 import logging
+from collections.abc import Awaitable, Callable
 from pathlib import Path
-from typing import Awaitable, Callable
 
 import blake3
-
 from meshbay_common.protocol import IndexEntry
+
 from meshbay_node.indexer import title_parse
 from meshbay_node.indexer.indexer import MEDIA_EXTENSIONS
 from meshbay_node.media_cache import MediaCache
@@ -173,7 +173,7 @@ async def _make_thumbnail(file_path: Path, duration: float | None) -> bytes | No
     )
     try:
         stdout, _ = await asyncio.wait_for(proc.communicate(), THUMB_TIMEOUT_SECS)
-    except asyncio.TimeoutError:
+    except TimeoutError:
         proc.kill()
         await proc.wait()
         return None
diff --git a/packages/meshbay-node/src/meshbay_node/indexer/enrich_photo.py b/packages/meshbay-node/src/meshbay_node/indexer/enrich_photo.py
index 6613f85..5cacef9 100644
--- a/packages/meshbay-node/src/meshbay_node/indexer/enrich_photo.py
+++ b/packages/meshbay-node/src/meshbay_node/indexer/enrich_photo.py
@@ -22,13 +22,13 @@ import asyncio
 import datetime
 import io
 import logging
+from collections.abc import Awaitable, Callable
 from pathlib import Path
-from typing import Awaitable, Callable
 
 import blake3
+from meshbay_common.protocol import IndexEntry
 from PIL import ExifTags, Image, ImageOps
 
-from meshbay_common.protocol import IndexEntry
 from meshbay_node.media_cache import MediaCache
 
 log = logging.getLogger(__name__)
diff --git a/packages/meshbay-node/src/meshbay_node/indexer/group_index.py b/packages/meshbay-node/src/meshbay_node/indexer/group_index.py
index 2340c78..9e4e780 100644
--- a/packages/meshbay-node/src/meshbay_node/indexer/group_index.py
+++ b/packages/meshbay-node/src/meshbay_node/indexer/group_index.py
@@ -13,29 +13,27 @@ Delta format:
 
 import base64
 import logging
-import os
-import time
-from dataclasses import dataclass, field, asdict
-from pathlib import Path
-from typing import Iterator
+from dataclasses import asdict, dataclass, field
 
 import blake3
 import msgpack
 import zstandard as zstd
 from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PrivateKey
-
 from meshbay_common.crypto import (
+    pk_to_b64,
     sign_chunk,
     verify_chunk_signature,
-    pk_to_b64,
-    generate_gek,
 )
+from meshbay_common.protocol import IndexDelta, IndexEntry
 from meshbay_common.webcrypto import (
     chunk_key_aes as derive_chunk_key,
-    encrypt_chunk_aes as encrypt_chunk,
+)
+from meshbay_common.webcrypto import (
     decrypt_chunk_aes as decrypt_chunk,
 )
-from meshbay_common.protocol import IndexEntry, IndexDelta
+from meshbay_common.webcrypto import (
+    encrypt_chunk_aes as encrypt_chunk,
+)
 
 log = logging.getLogger(__name__)
 
@@ -171,7 +169,6 @@ class GroupIndex:
     ) -> "GroupIndex":
         """Deserialize, verify signature, and decrypt (if private)."""
         from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PublicKey
-        from meshbay_common.crypto import verify_chunk_signature
 
         envelope = msgpack.unpackb(data, raw=False)
 
diff --git a/packages/meshbay-node/src/meshbay_node/indexer/indexer.py b/packages/meshbay-node/src/meshbay_node/indexer/indexer.py
index 3fe4f3e..4b619d7 100644
--- a/packages/meshbay-node/src/meshbay_node/indexer/indexer.py
+++ b/packages/meshbay-node/src/meshbay_node/indexer/indexer.py
@@ -25,19 +25,20 @@ it is the only thing that recovers a missed event.
 import asyncio
 import logging
 import time
+from collections.abc import Awaitable, Callable
 from concurrent.futures import ThreadPoolExecutor
-from dataclasses import dataclass, field as dataclass_field
+from dataclasses import dataclass
+from dataclasses import field as dataclass_field
 from pathlib import Path
-from typing import Callable, Awaitable
 
 import blake3
 from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PrivateKey
+from meshbay_common.background import spawn
+from meshbay_common.paths import find_fold_collisions, fold, long_path
+from meshbay_common.protocol import IndexEntry
 from watchdog.events import FileSystemEvent, FileSystemEventHandler
 from watchdog.observers import Observer
 
-from meshbay_common.background import spawn
-from meshbay_common.paths import fold, find_fold_collisions, long_path
-from meshbay_common.protocol import IndexEntry
 from meshbay_node.indexer.cache import IndexCache
 from meshbay_node.indexer.group_index import GroupIndex
 from meshbay_node.roots import Root, RootSet, off_disk
diff --git a/packages/meshbay-node/src/meshbay_node/indexer/title_parse.py b/packages/meshbay-node/src/meshbay_node/indexer/title_parse.py
index 14728ff..5df70c4 100644
--- a/packages/meshbay-node/src/meshbay_node/indexer/title_parse.py
+++ b/packages/meshbay-node/src/meshbay_node/indexer/title_parse.py
@@ -19,7 +19,7 @@ directory listing; this module only parses strings it's handed.
 from __future__ import annotations
 
 import re
-from dataclasses import dataclass, field
+from dataclasses import dataclass
 
 from guessit import guessit