fix(tool-config): share task_system resolution

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/plugin-handlers/tool-config-handler.ts

@@ -1,5 +1,6 @@
 import type { OhMyOpenCodeConfig } from "../config";
 import { getAgentDisplayName, getAgentListDisplayName } from "../shared/agent-display-names";
+import { isTaskSystemEnabled } from "../shared/task-system-enabled";
 
 type AgentWithPermission = { permission?: Record<string, unknown> };
 
@@ -25,7 +26,7 @@ export function applyToolConfig(params: {
   pluginConfig: OhMyOpenCodeConfig;
   agentResult: Record<string, unknown>;
 }): void {
-  const taskSystemEnabled = params.pluginConfig.experimental?.task_system ?? false
+  const taskSystemEnabled = isTaskSystemEnabled(params.pluginConfig)
   const denyTodoTools = taskSystemEnabled
     ? { todowrite: "deny", todoread: "deny" }
     : {}