SAFETY-119 round 2: test_safety119 reads through named_absence

test_named_absence flagged two unguarded reads (next() without a default,
a list indexed in a check name). Use first(), nth() and present().

Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Bdqr7PiaHcBnzPituu2yTC

goodwe_controller/test_safety119.py

@@ -53,6 +53,7 @@ import app.main as app_main                                    # noqa: E402
 from app import messages                                       # noqa: E402
 from app.main import Controller                                # noqa: E402
 from app.p1 import make_sample, split_signed                   # noqa: E402
+from named_absence import first, nth, present                  # noqa: E402
 
 fails = []
 OPT0 = dict(s84.OPT)
@@ -437,10 +438,10 @@ check(f"at 5 s, one bound cycle per turn: {M} are hidden, the {M + 1}th and "
       _hid == [True] * M + [False] * (20 - M))
 _c = _C()
 _o, _ = turns(_c, 1.0, 2, 1, 12)
-_first = next(t for t, h in _o if not h)
+_first, _o0 = first(t for t, h in _o if not h), nth(_o, 0)[0]
 check(f"at 1 s the span holds too: not counted before {SPAN:.0f} s after "
       f"the first hidden one (counted at {_first:.0f} s)",
-      _o[0][0] + SPAN <= _first <= _o[0][0] + SPAN + 3.0
+      present(_first, _o0) and _o0 + SPAN <= _first <= _o0 + SPAN + 3.0
       and sum(h for _t, h in _o) > M)
 _c = _C()
 _t = 0.0