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/lasuite-docs/functional/test_health_check.py

@@ -22,7 +22,11 @@ def test_lasuite_docs_returns_200(live_app):
     url = f"https://{live_app}/"
     # accept 200 (frontend SPA shell) — lasuite-docs serves the SPA at root unauthenticated;
     # the SPA itself bootstraps via /api/v1.0/users/me/ which requires OIDC (separate test).
-    status, _ = harness_http.retry_http_get(url, expect_status=(200, 301, 302), max_wait=60, interval=3)
-    assert status in (200, 301, 302), (
-        f"lasuite-docs at {url} returned HTTP {status} (expected 200/301/302)"
+    status, _ = harness_http.retry_http_get(
+        url, expect_status=(200, 301, 302), max_wait=60, interval=3
     )
+    assert status in (
+        200,
+        301,
+        302,
+    ), f"lasuite-docs at {url} returned HTTP {status} (expected 200/301/302)"