research: Dütsch — fix int-key dict test, emit conservative pass per comparison

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/unit/test_duetsch_protocol.py

@@ -32,14 +32,14 @@ def test_phase_and_cycle_bookkeeping():
 def test_settling_and_common_window():
     passes = {k: True for k in range(3, 12)}
     assert p.settled_start(passes) == 7                          # pairs 3->4, 4->5, 5->6
-    late = dict(passes, **{5: False})
+    late = {**passes, 5: False}
     assert p.settled_start(late) == 9                            # pairs 6->7, 7->8, 8->9
     assert p.common_window([7, 9], [passes, passes]) == (9, 10, 11)
     assert p.common_window([7, 10], [passes, passes]) is None    # K + 2 = 12 beyond the cap
     assert p.common_window([7, None], [passes, passes]) is None
-    assert p.common_window([7, 7], [passes, dict(passes, **{8: False})]) is None  # must stay settled
+    assert p.common_window([7, 7], [passes, {**passes, 8: False}]) is None  # must stay settled
     # a case settled early must keep passing while waiting for the common K
-    assert p.common_window([7, 9], [dict(passes, **{8: False}), passes]) is None
+    assert p.common_window([7, 9], [{**passes, 8: False}, passes]) is None
 
 
 def test_solid_aware_bilinear():