chore(core): remove redundant getters from config in agent-tool branch

packages/core/src/config/config.ts

@@ -2604,10 +2604,6 @@ export class Config implements McpContext, AgentLoopContext {
     return this.experimentalContextManagementConfig;
   }
 
-  isAgentSessionEnabled(): boolean {
-    return this.agentSessionSubagentEnabled;
-  }
-
   getContextManagementConfig(): ContextManagementConfig {
     return this.contextManagement;
   }
@@ -3818,10 +3814,6 @@ export class Config implements McpContext, AgentLoopContext {
     );
   }
 
-  getAgentSessionSubagentEnabled(): boolean {
-    return this.agentSessionSubagentEnabled;
-  }
-
   /**
    * Get override settings for a specific agent.
    * Reads from agents.overrides.<agentName>.