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, 5 insertions, 7 deletions

diff --git a/packages/meshbay-node/tests/transfer_probe.py b/packages/meshbay-node/tests/transfer_probe.py
index 38e6cb6..7aa4902 100755
--- a/packages/meshbay-node/tests/transfer_probe.py
+++ b/packages/meshbay-node/tests/transfer_probe.py
@@ -69,9 +69,8 @@ if not (_QE / "e2e.py").exists():
         f"run this from a machine that has one.")
 sys.path.insert(0, str(_QE))
 
-import httpx   # noqa: E402
-
-from e2e import Client, env   # noqa: E402
+import httpx  # noqa: E402
+from e2e import Client, env  # noqa: E402
 
 
 def _line(ok: bool, text: str) -> None:
@@ -272,7 +271,6 @@ async def operator_checks(client, ack, group, node_id) -> int:
     and the operator's view because it reported the module defaults.
     """
     import asyncio as _a
-    import json as _json
     import re as _re
 
     failures = 0
@@ -322,7 +320,7 @@ async def operator_checks(client, ack, group, node_id) -> int:
     try:
         started = await _a.wait_for(
             _wait_for_grant(client, tr_waiting), timeout=20)
-    except _a.TimeoutError:
+    except TimeoutError:
         started = False
     _line(started, "raising the cap started the waiting transfer, with no "
                    "restart and no reconnection")
@@ -371,7 +369,7 @@ async def operator_checks(client, ack, group, node_id) -> int:
     _cli("transfers", "per-member", "4", "4", "--group", group["id"])
     try:
         moved = await _a.wait_for(_wait_for_grant(client, tr_c), timeout=20)
-    except _a.TimeoutError:
+    except TimeoutError:
         moved = False
     _line(moved, "raising the per-member cap started what was waiting on it")
     failures += not moved
@@ -526,7 +524,7 @@ async def probe(args) -> int:
                 try:
                     seen.append(await alice.recv_type("transfer_state",
                                                       timeout=15))
-                except asyncio.TimeoutError:
+                except TimeoutError:
                     break
             promoted = [m for m in seen if m.get("state") == "granted"]
             ok = bool(promoted)