feat(task): add structured run evidence

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

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+from __future__ import annotations
+
+from pathlib import Path
+
+from beaver.engine.session.manager import SessionManager
+from beaver.tasks.evidence import EvidenceBuilder, RunEvidence, TaskEvidencePacket, render_task_evidence
+
+
+def test_evidence_builder_preserves_full_tool_result(tmp_path: Path) -> None:
+    session_manager = SessionManager(tmp_path)
+    session_id = "session-1"
+    run_id = "run-1"
+    long_content = "prefix " + ("x" * 700) + " MAN 3 FT 2 NFO"
+    session_manager.ensure_session(session_id, source="test")
+    session_manager.append_message(session_id, run_id=run_id, role="user", event_type="user_message_added", content="score?")
+    session_manager.append_message(
+        session_id,
+        run_id=run_id,
+        role="tool",
+        event_type="tool_result_recorded",
+        event_payload={"success": True, "url": "https://example.test/match"},
+        content=long_content,
+        tool_name="web_fetch",
+        tool_call_id="call-1",
+    )
+    session_manager.append_message(
+        session_id,
+        run_id=run_id,
+        role="system",
+        event_type="run_completed",
+        event_payload={"finish_reason": "stop"},
+        content="Manchester United won 3-2.",
+        finish_reason="stop",
+        context_visible=False,
+    )
+
+    evidence = EvidenceBuilder(session_manager).build_run_evidence(
+        session_id=session_id,
+        run_id=run_id,
+        output_text="Manchester United won 3-2.",
+        finish_reason="stop",
+    )
+    rendered = render_task_evidence(
+        TaskEvidencePacket(
+            task_id="task-1",
+            attempt_index=1,
+            main_run=evidence,
+            team_runs=[],
+            team_node_results=[],
+            final_output="Manchester United won 3-2.",
+        )
+    )
+
+    assert evidence.tool_results[0].content == long_content
+    assert "MAN 3 FT 2 NFO" in rendered
+    assert "https://example.test/match" in rendered
+
+
+def test_render_task_evidence_includes_failed_team_run_tool_results() -> None:
+    run = RunEvidence(
+        run_id="run-team",
+        session_id="session-team",
+        output_text="Tool loop stopped.",
+        finish_reason="max_tool_iterations",
+        transcript=[],
+        tool_results=[],
+        warnings=["finish_reason=max_tool_iterations"],
+    )
+    packet = TaskEvidencePacket(
+        task_id="task-1",
+        attempt_index=2,
+        main_run=None,
+        team_runs=[run],
+        team_node_results=[],
+        final_output="partial answer",
+    )
+
+    rendered = render_task_evidence(packet)
+
+    assert "finish_reason=max_tool_iterations" in rendered
+    assert "partial answer" in rendered