feat(task-system): add experimental task system with Claude Code spec alignment (#1415)

* feat(hooks): add tasks-todowrite-disabler hook to block TodoRead/TodoWrite

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

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

* feat(task-tools): add parallel execution guidance to descriptions

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

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

* refactor(index): migrate task system to experimental.task_system flag

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

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

* docs: update AGENTS.md for experimental task system

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

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

* fix(task-tests): align test field names with Claude Code spec (subject, blockedBy, addBlockedBy)

* fix: address Cubic review feedback

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

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

* fix: add optional chaining for tasksTodowriteDisabler null check

---------

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

src/index.ts

@@ -36,6 +36,7 @@ import {
   createCompactionContextInjector,
   createUnstableAgentBabysitterHook,
   createPreemptiveCompactionHook,
+  createTasksTodowriteDisablerHook,
 } from "./hooks";
 import {
   contextCollector,
@@ -269,6 +270,12 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
     ? createSisyphusJuniorNotepadHook(ctx)
     : null;
 
+  const tasksTodowriteDisabler = isHookEnabled("tasks-todowrite-disabler")
+    ? createTasksTodowriteDisablerHook({
+        experimental: pluginConfig.experimental,
+      })
+    : null;
+
   const questionLabelTruncator = createQuestionLabelTruncatorHook();
   const subagentQuestionBlocker = createSubagentQuestionBlockerHook();
 
@@ -464,8 +471,8 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
     modelCacheState,
   });
 
-  const newTaskSystemEnabled = pluginConfig.new_task_system_enabled ?? false;
-  const taskToolsRecord: Record<string, ToolDefinition> = newTaskSystemEnabled
+  const taskSystemEnabled = pluginConfig.experimental?.task_system ?? false;
+  const taskToolsRecord: Record<string, ToolDefinition> = taskSystemEnabled
     ? {
         task_create: createTaskCreateTool(pluginConfig, ctx),
         task_get: createTaskGetTool(pluginConfig),
@@ -714,10 +721,11 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
       await questionLabelTruncator["tool.execute.before"]?.(input, output);
       await claudeCodeHooks["tool.execute.before"](input, output);
       await nonInteractiveEnv?.["tool.execute.before"](input, output);
-      await commentChecker?.["tool.execute.before"](input, output);
+      await commentChecker?.["tool.execute.before"]?.(input, output);
       await directoryAgentsInjector?.["tool.execute.before"]?.(input, output);
       await directoryReadmeInjector?.["tool.execute.before"]?.(input, output);
       await rulesInjector?.["tool.execute.before"]?.(input, output);
+      await tasksTodowriteDisabler?.["tool.execute.before"]?.(input, output);
       await prometheusMdOnly?.["tool.execute.before"]?.(input, output);
       await sisyphusJuniorNotepad?.["tool.execute.before"]?.(input, output);
       await atlasHook?.["tool.execute.before"]?.(input, output);