fix: MCP client compatibility — ignore unknown fields in protocol messages

VS Code MCP client sends capabilities.elicitation.form which Spring AI
1.1.4's McpSchema doesn't recognize, causing deserialization failure.

Fix: disable FAIL_ON_UNKNOWN_PROPERTIES in both Jackson ObjectMapper bean
and application.yml so newer MCP protocol fields are silently ignored.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: aksOps

src/main/java/io/github/randomcodespace/iq/config/JacksonConfig.java

@@ -1,14 +1,18 @@
 package io.github.randomcodespace.iq.config;
 
+import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.SerializationFeature;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
 /**
- * Provides an ObjectMapper bean when Spring Boot's web auto-configuration
- * is not active (e.g., indexing profile with WebApplicationType.NONE).
+ * Jackson configuration.
+ * <p>
+ * Disables FAIL_ON_UNKNOWN_PROPERTIES globally so that newer MCP clients
+ * sending fields not yet in Spring AI's McpSchema (e.g., capabilities.elicitation.form)
+ * don't cause deserialization failures.
  */
 @Configuration
 public class JacksonConfig {
@@ -17,6 +21,7 @@ public class JacksonConfig {
     @ConditionalOnMissingBean(ObjectMapper.class)
     public ObjectMapper objectMapper() {
         return new ObjectMapper()
-                .disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
+                .disable(SerializationFeature.FAIL_ON_EMPTY_BEANS)
+                .disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
     }
 }

src/main/resources/application.yml

@@ -7,6 +7,9 @@ spring:
   threads:
     virtual:
       enabled: true
+  jackson:
+    deserialization:
+      fail-on-unknown-properties: false
   # Neo4j runs in embedded mode — no Bolt URI needed.
   # See Neo4jConfig.java and codeiq.graph.path below.