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/unit/test_f212_upgrade_convergence.py

@@ -32,7 +32,9 @@ def _fake_clock(monkeypatch):
 
 
 _DRIVE_META = {
-    "READY_PROBE": lambda d: [{"host": f"collabora-{d}", "path": "/hosting/discovery", "ok": (200,)}]
+    "READY_PROBE": lambda d: [
+        {"host": f"collabora-{d}", "path": "/hosting/discovery", "ok": (200,)}
+    ]
 }
 
 
@@ -73,4 +75,6 @@ def test_wait_healthy_raises_when_converged_but_never_serves(monkeypatch):
     monkeypatch.setattr(lc, "services_converged", lambda domain: True)
     monkeypatch.setattr(lc, "http_get", lambda *a, **k: 502)
     with pytest.raises(TimeoutError):
-        lc.wait_healthy("x.ci.commoninternet.net", ok_codes=(200,), deploy_timeout=60, http_timeout=60)
+        lc.wait_healthy(
+            "x.ci.commoninternet.net", ok_codes=(200,), deploy_timeout=60, http_timeout=60
+        )