fix: 彻底移除 /loop 及 cron 工具的 feature('AGENT_TRIGGERS') gate

上次提交仅移除了 isKairosCronEnabled 中的 gate，但 /loop 整条链路
仍被 feature('AGENT_TRIGGERS') 拦截导致无法使用：
- skills/bundled/index.ts: registerLoopSkill() 未被调用
- tools.ts: CronCreate/Delete/List 工具未加载
- constants/tools.ts: cron 工具名未加入 teammate 工具列表
- screens/REPL.tsx: useScheduledTasks hook 被跳过
- cli/print.ts: pipe 模式 cron 调度器未初始化

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/constants/tools.ts

@@ -82,9 +82,7 @@ export const IN_PROCESS_TEAMMATE_ALLOWED_TOOLS = new Set([
   SEND_MESSAGE_TOOL_NAME,
   // Teammate-created crons are tagged with the creating agentId and routed to
   // that teammate's pendingUserMessages queue (see useScheduledTasks.ts).
-  ...(feature('AGENT_TRIGGERS')
-    ? [CRON_CREATE_TOOL_NAME, CRON_DELETE_TOOL_NAME, CRON_LIST_TOOL_NAME]
-    : []),
+  CRON_CREATE_TOOL_NAME, CRON_DELETE_TOOL_NAME, CRON_LIST_TOOL_NAME,
 ])
 
 /*