Accept governed boolean leaves in memo envelopes.

type() excluded bool even though bool subclasses int, so schema fields
requires_new_bind, required_ack, and sealed failed as invalid_type.
Unknown leaves still fail closed. No submitter, token, or write-back change.

Assistant: grok
Assistant-Session: 01a10286-9185-7bb2-b411-89cf6ab4c0c6

tests/test_memo_forwarding.py

@@ -132,6 +132,25 @@ def test_envelope_is_bounded_and_does_not_echo_secrets():
     assert unknown.value.code == "unknown_field"
 
 
+def test_governed_boolean_leaves_round_trip():
+    checked = envelope(memo={
+        "id": MEMO,
+        "question": "Accept the forwarded draft?",
+        "sealed": False,
+        "binding": {"target": {"requires_new_bind": True}},
+        "highlights": [{"required_ack": True}],
+    })
+    memo = checked["memo"]
+    assert memo["sealed"] is False
+    assert memo["binding"]["target"]["requires_new_bind"] is True
+    assert memo["highlights"][0]["required_ack"] is True
+    rejected = envelope()
+    rejected["memo"]["marker"] = object()
+    with pytest.raises(ContractError) as error:
+        validate_envelope(rejected)
+    assert error.value.code == "invalid_type"
+
+
 def test_pose_replay_conflict_and_asserted_provenance(tmp_path):
     clock = Clock()
     transport = Transport([(201, receipt())])