feat(core): add attributes field to storage records and detail/summary models (Task 2)

Adds Map<String,String> attributes to ExecutionRecord, ProcessorRecord,
ExecutionDetail, ProcessorNode, and ExecutionSummary. ExecutionStore records
carry attributes as a JSON string; detail/summary models carry deserialized maps.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

cameleer3-server-core/src/main/java/com/cameleer3/server/core/detail/ExecutionDetail.java

@@ -2,6 +2,7 @@ package com.cameleer3.server.core.detail;
 
 import java.time.Instant;
 import java.util.List;
+import java.util.Map;
 
 /**
  * Full detail of a route execution, including the nested processor tree.
@@ -45,6 +46,7 @@ public record ExecutionDetail(
         String inputBody,
         String outputBody,
         String inputHeaders,
-        String outputHeaders
+        String outputHeaders,
+        Map<String, String> attributes
 ) {
 }

cameleer3-server-core/src/main/java/com/cameleer3/server/core/detail/ProcessorNode.java

@@ -3,6 +3,7 @@ package com.cameleer3.server.core.detail;
 import java.time.Instant;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Map;
 
 /**
  * Nested tree node representing a single processor execution within a route.
@@ -21,11 +22,13 @@ public final class ProcessorNode {
     private final String diagramNodeId;
     private final String errorMessage;
     private final String errorStackTrace;
+    private final Map<String, String> attributes;
     private final List<ProcessorNode> children;
 
     public ProcessorNode(String processorId, String processorType, String status,
                          Instant startTime, Instant endTime, long durationMs,
-                         String diagramNodeId, String errorMessage, String errorStackTrace) {
+                         String diagramNodeId, String errorMessage, String errorStackTrace,
+                         Map<String, String> attributes) {
         this.processorId = processorId;
         this.processorType = processorType;
         this.status = status;
@@ -35,6 +38,7 @@ public final class ProcessorNode {
         this.diagramNodeId = diagramNodeId;
         this.errorMessage = errorMessage;
         this.errorStackTrace = errorStackTrace;
+        this.attributes = attributes;
         this.children = new ArrayList<>();
     }
 
@@ -51,5 +55,6 @@ public final class ProcessorNode {
     public String getDiagramNodeId() { return diagramNodeId; }
     public String getErrorMessage() { return errorMessage; }
     public String getErrorStackTrace() { return errorStackTrace; }
+    public Map<String, String> getAttributes() { return attributes; }
     public List<ProcessorNode> getChildren() { return List.copyOf(children); }
 }

cameleer3-server-core/src/main/java/com/cameleer3/server/core/search/ExecutionSummary.java

@@ -1,6 +1,7 @@
 package com.cameleer3.server.core.search;
 
 import java.time.Instant;
+import java.util.Map;
 
 /**
  * Lightweight summary of a route execution for search result listings.
@@ -31,6 +32,7 @@ public record ExecutionSummary(
         String correlationId,
         String errorMessage,
         String diagramContentHash,
-        String highlight
+        String highlight,
+        Map<String, String> attributes
 ) {
 }

cameleer3-server-core/src/main/java/com/cameleer3/server/core/storage/ExecutionStore.java

@@ -22,7 +22,8 @@ public interface ExecutionStore {
             Instant startTime, Instant endTime, Long durationMs,
             String errorMessage, String errorStacktrace, String diagramContentHash,
             String engineLevel,
-            String inputBody, String outputBody, String inputHeaders, String outputHeaders
+            String inputBody, String outputBody, String inputHeaders, String outputHeaders,
+            String attributes
     ) {}
 
     record ProcessorRecord(
@@ -31,6 +32,7 @@ public interface ExecutionStore {
             int depth, String parentProcessorId, String status,
             Instant startTime, Instant endTime, Long durationMs,
             String errorMessage, String errorStacktrace,
-            String inputBody, String outputBody, String inputHeaders, String outputHeaders
+            String inputBody, String outputBody, String inputHeaders, String outputHeaders,
+            String attributes
     ) {}
 }