Harden evidence trace semantics

src/test/java/com/superbiz/agent/tool/LookupKnowledgeToolTest.java

@@ -3,7 +3,9 @@ package com.superbiz.agent.tool;
 import com.superbiz.agent.dto.KnowledgeEntry;
 import com.superbiz.agent.dto.LookupResult;
 import com.superbiz.agent.service.KnowledgeIndexService;
+import com.superbiz.agent.service.ToolInvocationRecorder;
 import com.superbiz.agent.service.VectorSearchService;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.mockito.InjectMocks;
@@ -28,6 +30,15 @@ class LookupKnowledgeToolTest {
     @Mock
     private VectorSearchService vectorSearchService;
 
+    @Mock
+    private ToolInvocationRecorder toolInvocationRecorder;
+
+    @Mock
+    private RetrievedDocTracker retrievedDocTracker;
+
+    @Mock
+    private ObjectMapper objectMapper;
+
     @InjectMocks
     private LookupKnowledgeTool tool;