test(wiki): cover StageInstructions string/object deserialization

Add unit coverage for the StageInstructions custom deserializer: plain-string
shorthand, full object with instructions+template, unknown-field skipping, and
both forms coexisting on one WikiPageTypeDef (backward compatibility).

mateclaw-server/src/test/java/vip/mate/wiki/profile/WikiPageTypeDefStageInstructionsTest.java

@@ -0,0 +1,56 @@
+package vip.mate.wiki.profile;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+/**
+ * Deserialization tests for {@link WikiPageTypeDef.StageInstructions}: a stage
+ * field (route / create / merge) may be written either as a plain prompt string
+ * or as a full object with {@code instructions} + {@code template}. Both forms
+ * must be equivalent, and existing object configs must keep parsing.
+ */
+class WikiPageTypeDefStageInstructionsTest {
+
+    private final ObjectMapper mapper = new ObjectMapper();
+
+    @Test
+    void plainStringShorthandMapsToInstructions() throws Exception {
+        WikiPageTypeDef.StageInstructions si =
+                mapper.readValue("\"just a prompt\"", WikiPageTypeDef.StageInstructions.class);
+        assertEquals("just a prompt", si.getInstructions());
+        assertNull(si.getTemplate());
+    }
+
+    @Test
+    void fullObjectParsesBothFields() throws Exception {
+        WikiPageTypeDef.StageInstructions si = mapper.readValue(
+                "{\"instructions\":\"do X\",\"template\":\"tpl-key\"}",
+                WikiPageTypeDef.StageInstructions.class);
+        assertEquals("do X", si.getInstructions());
+        assertEquals("tpl-key", si.getTemplate());
+    }
+
+    @Test
+    void unknownFieldInObjectIsSkipped() throws Exception {
+        WikiPageTypeDef.StageInstructions si = mapper.readValue(
+                "{\"instructions\":\"keep\",\"extra\":{\"nested\":1}}",
+                WikiPageTypeDef.StageInstructions.class);
+        assertEquals("keep", si.getInstructions());
+        assertNull(si.getTemplate());
+    }
+
+    @Test
+    void stringAndObjectFormsCoexistInsidePageTypeDef() throws Exception {
+        // route as the string shorthand, create as the full object — both on one def.
+        String json = "{\"route\":\"route prompt\","
+                + "\"create\":{\"instructions\":\"create prompt\",\"template\":\"t1\"}}";
+        WikiPageTypeDef def = mapper.readValue(json, WikiPageTypeDef.class);
+        assertEquals("route prompt", def.getRoute().getInstructions());
+        assertNull(def.getRoute().getTemplate());
+        assertEquals("create prompt", def.getCreate().getInstructions());
+        assertEquals("t1", def.getCreate().getTemplate());
+    }
+}