fix(tasks-hook): share task_system resolution

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

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

src/hooks/tasks-todowrite-disabler/hook.ts

@@ -1,3 +1,4 @@
+import { isTaskSystemEnabled } from "../../shared/task-system-enabled";
 import { BLOCKED_TOOLS, REPLACEMENT_MESSAGE } from "./constants";
 
 export interface TasksTodowriteDisablerConfig {
@@ -9,14 +10,14 @@ export interface TasksTodowriteDisablerConfig {
 export function createTasksTodowriteDisablerHook(
   config: TasksTodowriteDisablerConfig,
 ) {
-  const isTaskSystemEnabled = config.experimental?.task_system ?? true;
+  const taskSystemEnabled = isTaskSystemEnabled(config);
 
   return {
     "tool.execute.before": async (
       input: { tool: string; sessionID: string; callID: string },
       _output: { args: Record<string, unknown> },
     ) => {
-      if (!isTaskSystemEnabled) {
+      if (!taskSystemEnabled) {
         return;
       }