style: repo-wide lint pass — make the lint gate green again

Push builds have been RED on the lint step since ~build 209 from accumulated
formatting drift. This is the mechanical cleanup: ruff format + ruff --fix
(UP038 isinstance unions, SIM105 contextlib.suppress, UP031 f-strings, SIM115
tempfile context manager), shfmt -i 2 -ci, nixpkgs-fmt/statix/deadnix (merged
attrsets, dropped unused lib args), yamllint, and shell quoting fixes in
tests/lasuite-docs/setup_custom_tests.sh. No behaviour changes intended;
lint: PASS, unit tests: 138 passed.

tests/matrix-synapse/functional/test_federation_version.py

@@ -34,12 +34,12 @@ def test_federation_version_endpoint(live_app):
     assert status == 200, f"GET {url} HTTP {status} (expected 200)"
     assert isinstance(body, dict), f"federation version returned non-dict: {type(body).__name__}"
     server = body.get("server")
-    assert isinstance(server, dict), (
-        f"federation version response missing 'server' envelope: {body!r}"
-    )
+    assert isinstance(
+        server, dict
+    ), f"federation version response missing 'server' envelope: {body!r}"
     name = server.get("name")
     assert name == "Synapse", f"server.name={name!r}, expected 'Synapse'"
     version = server.get("version")
-    assert isinstance(version, str) and len(version) > 0, (
-        f"server.version is not a non-empty string: {version!r}"
-    )
+    assert (
+        isinstance(version, str) and len(version) > 0
+    ), f"server.version is not a non-empty string: {version!r}"

tests/matrix-synapse/functional/test_health_check.py

@@ -11,7 +11,6 @@ Runs in the custom tier against the shared post-install live deployment.
 
 from __future__ import annotations
 
-import json
 import os
 import sys
 
@@ -24,6 +23,6 @@ def test_synapse_client_versions_returns_json(live_app):
     url = f"https://{live_app}/_matrix/client/versions"
     status, body = harness_http.retry_http_get(url, expect_status=200, max_wait=60, interval=3)
     assert status == 200, f"GET {url} HTTP {status} (expected 200)"
-    assert isinstance(body, dict) and isinstance(body.get("versions"), list) and body["versions"], (
-        f"GET {url} did not return Matrix client-versions document: {body!r}"
-    )
+    assert (
+        isinstance(body, dict) and isinstance(body.get("versions"), list) and body["versions"]
+    ), f"GET {url} did not return Matrix client-versions document: {body!r}"

tests/matrix-synapse/functional/test_register_and_message.py

@@ -42,7 +42,8 @@ import sys
 import uuid
 
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "..", "..", "runner"))
-from harness import http as harness_http, lifecycle  # noqa: E402
+from harness import http as harness_http  # noqa: E402
+from harness import lifecycle
 
 
 def _registration_secret(domain: str) -> str:
@@ -101,8 +102,11 @@ def _admin_register(domain: str, secret: str, username: str, password: str, admi
         r = _container_curl(domain, "GET", "/_synapse/admin/v1/register")
         if r["status"] in (500, 502, 503, 504, 0):
             last = r
-            print(f"  [register] {username}: nonce GET transient {r['status']} "
-                  f"(attempt {attempt}, synapse recovering) — retrying", flush=True)
+            print(
+                f"  [register] {username}: nonce GET transient {r['status']} "
+                f"(attempt {attempt}, synapse recovering) — retrying",
+                flush=True,
+            )
             time.sleep(5)
             continue
         assert r["status"] == 200, f"nonce GET failed: status={r['status']} raw={r['raw'][:200]!r}"
@@ -122,13 +126,19 @@ def _admin_register(domain: str, secret: str, username: str, password: str, admi
         r = _container_curl(domain, "POST", "/_synapse/admin/v1/register", body=payload)
         if r["status"] == 200:
             if attempt > 1:
-                print(f"  [register] {username}: succeeded on attempt {attempt} "
-                      f"(synapse recovered)", flush=True)
+                print(
+                    f"  [register] {username}: succeeded on attempt {attempt} "
+                    f"(synapse recovered)",
+                    flush=True,
+                )
             return r["body"] or {}
         if r["status"] in (500, 502, 503, 504, 0):
             last = r
-            print(f"  [register] {username}: POST transient {r['status']} "
-                  f"(attempt {attempt}, synapse recovering) — retrying", flush=True)
+            print(
+                f"  [register] {username}: POST transient {r['status']} "
+                f"(attempt {attempt}, synapse recovering) — retrying",
+                flush=True,
+            )
             time.sleep(5)
             continue
         # a 4xx is a real rejection — fail fast, do not retry
@@ -167,9 +177,9 @@ def test_register_two_users_send_receive_message(live_app):
     create + invite + join a room; send and read a message."""
     domain = live_app
     secret = _registration_secret(domain)
-    assert secret and len(secret) >= 16, (
-        f"registration shared secret missing/short: len={len(secret) if secret else 0}"
-    )
+    assert (
+        secret and len(secret) >= 16
+    ), f"registration shared secret missing/short: len={len(secret) if secret else 0}"
 
     suffix = uuid.uuid4().hex[:8]
     user_a = f"alice{suffix}"