feat(t214): persist candidate observation identities

android-buyer/app/src/test/java/com/roubao/autopilot/pinduoduo/CandidateEvidenceSourceTest.kt

@@ -150,13 +150,14 @@ class CandidateEvidenceSourceTest {
         )
         return PinduoduoCandidateEvidence(
             ordinal = ordinal,
-            cardSignature = "card-$ordinal",
+            cardSignature = PinduoduoEvidenceHash.sha256("card-$ordinal"),
             cardSemanticTextCount = 3,
-            detailSignature = "detail-$ordinal",
+            detailSignature = PinduoduoEvidenceHash.sha256("detail-$ordinal"),
             detailSemanticTextCount = 4,
             detailAsset = asset,
             specification = specification(),
-            specificationAsset = asset.copy(fileName = specificationFileName)
+            specificationAsset = asset.copy(fileName = specificationFileName),
+            observedTitle = "候选商品标题 $ordinal"
         )
     }
 

android-buyer/app/src/test/java/com/roubao/autopilot/pinduoduo/PinduoduoObservedTitlePolicyTest.kt

@@ -0,0 +1,35 @@
+package com.roubao.autopilot.pinduoduo
+
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNull
+import org.junit.Test
+
+class PinduoduoObservedTitlePolicyTest {
+    @Test
+    fun `selects longest product-like semantic text`() {
+        val title = PinduoduoObservedTitlePolicy.select(
+            listOf(
+                "¥12.90",
+                "店铺客服",
+                "2026夏季纯棉宽松短袖圆领上衣",
+                "纯棉短袖"
+            )
+        )
+
+        assertEquals("2026夏季纯棉宽松短袖圆领上衣", title)
+    }
+
+    @Test
+    fun `rejects actions prices and numeric-only text`() {
+        val title = PinduoduoObservedTitlePolicy.select(
+            listOf(
+                "免拼购买",
+                "已选择 黑色 L",
+                "¥12.90",
+                "123456"
+            )
+        )
+
+        assertNull(title)
+    }
+}