refactor: derive processor-route mapping from diagrams instead of executions

Store application_name in route_diagrams at ingestion time (V7 migration),
resolve from agent registry same as ExecutionController. Move
findProcessorRouteMapping from ExecutionStore to DiagramStore using a
JSONB query that extracts node IDs directly from stored RouteGraph
definitions. This makes the mapping available as soon as diagrams are
sent, before any executions are recorded.

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

cameleer3-server-core/src/main/java/com/cameleer3/server/core/ingestion/TaggedDiagram.java

@@ -8,4 +8,4 @@ import com.cameleer3.common.graph.RouteGraph;
  * The agent ID is extracted from the SecurityContext in the controller layer
  * and carried through the write buffer so the flush scheduler can persist it.
  */
-public record TaggedDiagram(String agentId, RouteGraph graph) {}
+public record TaggedDiagram(String agentId, String applicationName, RouteGraph graph) {}

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

@@ -4,6 +4,7 @@ import com.cameleer3.common.graph.RouteGraph;
 import com.cameleer3.server.core.ingestion.TaggedDiagram;
 
 import java.util.List;
+import java.util.Map;
 import java.util.Optional;
 
 public interface DiagramStore {
@@ -15,4 +16,6 @@ public interface DiagramStore {
     Optional<String> findContentHashForRoute(String routeId, String agentId);
 
     Optional<String> findContentHashForRouteByAgents(String routeId, List<String> agentIds);
+
+    Map<String, String> findProcessorRouteMapping(String applicationName);
 }

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

@@ -2,7 +2,6 @@ package com.cameleer3.server.core.storage;
 
 import java.time.Instant;
 import java.util.List;
-import java.util.Map;
 import java.util.Optional;
 
 public interface ExecutionStore {
@@ -17,8 +16,6 @@ public interface ExecutionStore {
 
     List<ProcessorRecord> findProcessors(String executionId);
 
-    Map<String, String> findProcessorRouteMapping(String applicationName);
-
     record ExecutionRecord(
             String executionId, String routeId, String agentId, String applicationName,
             String status, String correlationId, String exchangeId,