First commit

tests/unit/test_langgraph_telemetry.py

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+import pytest
+from agent_framework.observability.langgraph_telemetry import LangGraphDeepTelemetry
+
+class FakeTelemetry:
+    def __init__(self): self.events=[]
+    async def event(self, name, payload=None, kind='event'):
+        self.events.append((name, payload or {}, kind))
+    def span(self, name, **attrs):
+        class CM:
+            async def __aenter__(self_inner): return None
+            async def __aexit__(self_inner, exc_type, exc, tb): return False
+        return CM()
+
+@pytest.mark.asyncio
+async def test_langgraph_node_emits_started_completed():
+    telemetry = FakeTelemetry()
+    tracer = LangGraphDeepTelemetry(telemetry)
+    async with tracer.node('router', {'session_id': 's1'}):
+        pass
+    names = [e[0] for e in telemetry.events]
+    assert 'langgraph.node.started' in names
+    assert 'langgraph.node.completed' in names
+
+@pytest.mark.asyncio
+async def test_langgraph_edge_event():
+    telemetry = FakeTelemetry()
+    tracer = LangGraphDeepTelemetry(telemetry)
+    await tracer.edge('routing', 'billing', {'session_id': 's1'}, {'confidence': 0.9})
+    assert telemetry.events[0][0] == 'langgraph.edge.selected'