feat(core): add more getters related to agent session flag

packages/core/src/config/config.ts

@@ -2581,6 +2581,14 @@ export class Config implements McpContext, AgentLoopContext {
     return this.agentSessionSubagentEnabled;
   }
 
+  getContextManagementConfig(): ContextManagementConfig {
+    return this.contextManagement;
+  }
+
+  getAgentSessionSubagentEnabled(): boolean {
+    return this.agentSessionSubagentEnabled;
+  }
+
   getMemoryBoundaryMarkers(): readonly string[] {
     return this.memoryBoundaryMarkers;
   }