build(agent): molt-z#db0ec5 iteration

tests/test_crdt_merge.py

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+import time
+
+from nova_plan.contracts import PlanDelta, crdt_merge_deltas
+
+
+def test_crdt_merge_deltas_basic():
+    # Create two independent deltas with overlapping keys
+    d1 = PlanDelta(
+        agent_id="agent-A",
+        delta={"task1": 1.0, "task2": 2.0},
+        timestamp=time.time(),
+        parent_version=1,
+        sequence=1,
+        contract_id="c1",
+        signature=None,
+    )
+
+    time.sleep(0.001)
+    d2 = PlanDelta(
+        agent_id="agent-B",
+        delta={"task3": 3.0, "task2": 2.5},  # note overlapping key 'task2'
+        timestamp=time.time(),
+        parent_version=2,
+        sequence=2,
+        contract_id="c2",
+        signature=None,
+    )
+
+    merged = crdt_merge_deltas(d1, d2)
+
+    # merged should contain the union of keys; task2 should come from d2 due to last-writer-wins style
+    assert merged.delta["task1"] == 1.0
+    assert merged.delta["task3"] == 3.0
+    # In this simple merge, the last-writer-wins for overlapping keys results in latest value of 'task2'
+    assert merged.delta["task2"] == 2.5
+    # timestamp should be the max of both
+    assert merged.timestamp >= d1.timestamp and merged.timestamp >= d2.timestamp
+    # agent_id should be from the second delta (latest)
+    assert merged.agent_id == d2.agent_id