Fix scheduled tasks and improve task scheduling UX

- Fix Apple Container mount issue: move groups/CLAUDE.md to groups/global/
  directory (Apple Container only supports directory mounts, not file mounts)
- Fix scheduled tasks for main group: properly detect isMain based on
  group_folder instead of always setting false
- Add isScheduledTask flag so agent knows when running as scheduled task
- Improve schedule_task tool description with clear format examples for
  cron, interval, and once schedule types
- Update global CLAUDE.md with instructions for scheduled tasks to use
  mcp__nanoclaw__send_message when needed

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

container/agent-runner/src/index.ts

@@ -14,6 +14,7 @@ interface ContainerInput {
   groupFolder: string;
   chatJid: string;
   isMain: boolean;
+  isScheduledTask?: boolean;
 }
 
 interface ContainerOutput {
@@ -219,11 +220,17 @@ async function main(): Promise<void> {
   let result: string | null = null;
   let newSessionId: string | undefined;
 
+  // Add context for scheduled tasks
+  let prompt = input.prompt;
+  if (input.isScheduledTask) {
+    prompt = `[SCHEDULED TASK - You are running automatically, not in response to a user message. Use mcp__nanoclaw__send_message if needed to communicate with the user.]\n\n${input.prompt}`;
+  }
+
   try {
     log('Starting agent...');
 
     for await (const message of query({
-      prompt: input.prompt,
+      prompt,
       options: {
         cwd: '/workspace/group',
         resume: input.sessionId,

container/agent-runner/src/ipc-mcp.ts

@@ -67,11 +67,16 @@ export function createIpcMcp(ctx: IpcMcpContext) {
 
       tool(
         'schedule_task',
-        'Schedule a recurring or one-time task. The task will run as a full agent with access to all tools.',
+        `Schedule a recurring or one-time task. The task will run as a full agent with access to all tools.
+
+IMPORTANT - schedule_value format depends on schedule_type:
+• cron: Standard cron expression (e.g., "*/5 * * * *" for every 5 minutes, "0 9 * * *" for daily at 9am)
+• interval: Milliseconds between runs (e.g., "300000" for 5 minutes, "3600000" for 1 hour)
+• once: ISO 8601 timestamp (e.g., "2026-02-01T15:30:00.000Z"). Calculate this from current time.`,
         {
           prompt: z.string().describe('What the agent should do when the task runs'),
-          schedule_type: z.enum(['cron', 'interval', 'once']).describe('Type of schedule'),
-          schedule_value: z.string().describe('Cron expression, interval in ms, or ISO timestamp'),
+          schedule_type: z.enum(['cron', 'interval', 'once']).describe('cron=recurring at specific times, interval=recurring every N ms, once=run once at specific time'),
+          schedule_value: z.string().describe('cron: "*/5 * * * *" | interval: milliseconds like "300000" | once: ISO timestamp like "2026-02-01T15:30:00.000Z"'),
           target_group: z.string().optional().describe('Target group folder (main only, defaults to current group)')
         },
         async (args) => {