feat: add crew context tracking for LLM guardrail events (#3111)

Add crew context tracking using OpenTelemetry baggage for thread-safe propagation. Context is set during kickoff and cleaned up in finally block. Added thread safety tests with mocked agent execution.

tests/utilities/crew/test_crew_context.py

@@ -0,0 +1,88 @@
+import uuid
+
+import pytest
+from opentelemetry import baggage
+from opentelemetry.context import attach, detach
+
+from crewai.utilities.crew.crew_context import get_crew_context
+from crewai.utilities.crew.models import CrewContext
+
+
+def test_crew_context_creation():
+    crew_id = str(uuid.uuid4())
+    context = CrewContext(id=crew_id, key="test-crew")
+    assert context.id == crew_id
+    assert context.key == "test-crew"
+
+
+def test_get_crew_context_with_baggage():
+    crew_id = str(uuid.uuid4())
+    assert get_crew_context() is None
+
+    crew_ctx = CrewContext(id=crew_id, key="test-key")
+    ctx = baggage.set_baggage("crew_context", crew_ctx)
+    token = attach(ctx)
+
+    try:
+        context = get_crew_context()
+        assert context is not None
+        assert context.id == crew_id
+        assert context.key == "test-key"
+    finally:
+        detach(token)
+
+    assert get_crew_context() is None
+
+
+def test_get_crew_context_empty():
+    assert get_crew_context() is None
+
+
+def test_baggage_nested_contexts():
+    crew_id1 = str(uuid.uuid4())
+    crew_id2 = str(uuid.uuid4())
+
+    crew_ctx1 = CrewContext(id=crew_id1, key="outer")
+    ctx1 = baggage.set_baggage("crew_context", crew_ctx1)
+    token1 = attach(ctx1)
+
+    try:
+        outer_context = get_crew_context()
+        assert outer_context.id == crew_id1
+        assert outer_context.key == "outer"
+
+        crew_ctx2 = CrewContext(id=crew_id2, key="inner")
+        ctx2 = baggage.set_baggage("crew_context", crew_ctx2)
+        token2 = attach(ctx2)
+
+        try:
+            inner_context = get_crew_context()
+            assert inner_context.id == crew_id2
+            assert inner_context.key == "inner"
+        finally:
+            detach(token2)
+
+        restored_context = get_crew_context()
+        assert restored_context.id == crew_id1
+        assert restored_context.key == "outer"
+    finally:
+        detach(token1)
+
+    assert get_crew_context() is None
+
+
+def test_baggage_exception_handling():
+    crew_id = str(uuid.uuid4())
+
+    crew_ctx = CrewContext(id=crew_id, key="test")
+    ctx = baggage.set_baggage("crew_context", crew_ctx)
+    token = attach(ctx)
+
+    with pytest.raises(ValueError):
+        try:
+            assert get_crew_context() is not None
+            raise ValueError("Test exception")
+        finally:
+            detach(token)
+
+    assert get_crew_context() is None