fix(shared): add task_system resolver

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

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

src/shared/index.ts

@@ -72,3 +72,4 @@ export * from "./plugin-command-discovery"
 export { SessionCategoryRegistry } from "./session-category-registry"
 export * from "./plugin-identity"
 export * from "./log-legacy-plugin-startup-warning"
+export * from "./task-system-enabled"

src/shared/task-system-enabled.test.ts

@@ -0,0 +1,44 @@
+import { describe, expect, test } from "bun:test"
+
+import { isTaskSystemEnabled } from "./task-system-enabled"
+
+describe("isTaskSystemEnabled", () => {
+  describe("#given experimental.task_system is omitted", () => {
+    test("#when resolving #then it defaults to false", () => {
+      // given
+      const config = {}
+
+      // when
+      const result = isTaskSystemEnabled(config)
+
+      // then
+      expect(result).toBe(false)
+    })
+  })
+
+  describe("#given experimental.task_system is enabled", () => {
+    test("#when resolving #then it returns true", () => {
+      // given
+      const config = { experimental: { task_system: true } }
+
+      // when
+      const result = isTaskSystemEnabled(config)
+
+      // then
+      expect(result).toBe(true)
+    })
+  })
+
+  describe("#given experimental.task_system is disabled", () => {
+    test("#when resolving #then it returns false", () => {
+      // given
+      const config = { experimental: { task_system: false } }
+
+      // when
+      const result = isTaskSystemEnabled(config)
+
+      // then
+      expect(result).toBe(false)
+    })
+  })
+})

src/shared/task-system-enabled.ts

@@ -0,0 +1,9 @@
+export interface TaskSystemConfig {
+  experimental?: {
+    task_system?: boolean
+  }
+}
+
+export function isTaskSystemEnabled(config: TaskSystemConfig): boolean {
+  return config.experimental?.task_system ?? false
+}