fix: align agent timeline event contract

app-instance/backend/tests/unit/test_process_projection.py

@@ -137,6 +137,8 @@ def test_process_projection_maps_task_team_events(tmp_path: Path) -> None:
 
     planned_event = next(event for event in projection["events"] if event["kind"] == "task_planned")
     assert planned_event["metadata"]["timeline_type"] == "plan"
+    assert planned_event["metadata"]["plan_mode"] == "team"
+    assert planned_event["metadata"]["strategy"] == "sequence"
     assert planned_event["metadata"]["selected_skill_names"] == ["research-workflow"]
 
     skill_event = next(event for event in projection["events"] if event["kind"] == "skill_selected")
@@ -149,6 +151,7 @@ def test_process_projection_maps_task_team_events(tmp_path: Path) -> None:
 
     node_event = next(event for event in projection["events"] if event["kind"] == "agent_finished")
     assert node_event["metadata"]["timeline_type"] == "agent_progress"
+    assert "node_result" not in node_event["metadata"]
 
     evidence_event = next(event for event in projection["events"] if event["kind"] == "task_result_ready")
     assert evidence_event["metadata"]["timeline_type"] == "result"
@@ -209,6 +212,32 @@ def test_process_projection_maps_failed_task_team_events(tmp_path: Path) -> None
     assert node_event["metadata"]["timeline_type"] == "agent_progress"
 
 
+def test_process_projection_uses_normalized_plan_metadata_defaults(tmp_path: Path) -> None:
+    session = SessionManager(tmp_path)
+    run_store = RunMemoryStore(tmp_path / "memory" / "runs")
+    session.append_message(
+        "web:test",
+        role="system",
+        event_type="task_execution_planned",
+        event_payload={
+            "task_id": "task-1",
+            "attempt_index": 1,
+            "plan_mode": None,
+            "strategy": None,
+        },
+        context_visible=False,
+    )
+
+    projection = SessionProcessProjector(session, run_store).project("web:test")
+
+    root_run = next(run for run in projection["runs"] if run["run_id"] == "task:task-1:attempt:1")
+    assert root_run["metadata"]["plan_mode"] == "single"
+    assert root_run["metadata"]["strategy"] == "single"
+    planned_event = next(event for event in projection["events"] if event["kind"] == "task_planned")
+    assert planned_event["metadata"]["plan_mode"] == "single"
+    assert planned_event["metadata"]["strategy"] == "single"
+
+
 def test_process_projection_exposes_ephemeral_guidance_artifacts(tmp_path: Path) -> None:
     session = SessionManager(tmp_path)
     run_store = RunMemoryStore(tmp_path / "memory" / "runs")