Persist trader V4 P0 decision trace

src/test/java/com/quantai/trader/evidence/EvidenceAppenderTest.java

@@ -3,6 +3,8 @@ package com.quantai.trader.evidence;
 import com.quantai.trader.domain.TraderEvidence;
 import org.junit.jupiter.api.Test;
 
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Map;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -10,7 +12,8 @@ import static org.assertj.core.api.Assertions.assertThat;
 class EvidenceAppenderTest {
     @Test
     void appendsEvidenceWithStageReasonAndDetails() {
-        EvidenceAppender appender = new EvidenceAppender();
+        RecordingEvidenceRepository repository = new RecordingEvidenceRepository();
+        EvidenceAppender appender = new EvidenceAppender(repository);
 
         TraderEvidence item = appender.append("run-1", "cycle-1", "PM_DECISION", true,
                 "OPEN_LONG_PM_PASS", null, Map.of("action", "OPEN_LONG"));
@@ -18,6 +21,19 @@ class EvidenceAppenderTest {
         assertThat(item.evidenceId()).isEqualTo("evidence_cycle-1_0");
         assertThat(item.pass()).isTrue();
         assertThat(item.detailsJson()).containsEntry("action", "OPEN_LONG");
-        assertThat(appender.all()).containsExactly(item);
+        assertThat(repository.items()).containsExactly(item);
+    }
+
+    private static final class RecordingEvidenceRepository implements TraderEvidenceRepository {
+        private final List<TraderEvidence> items = new ArrayList<>();
+
+        @Override
+        public void insert(TraderEvidence evidence) {
+            items.add(evidence);
+        }
+
+        List<TraderEvidence> items() {
+            return items;
+        }
     }
 }