fix: improve agent output schema, tool descriptions, and shutdown robustness

- Rename status→outputType, responded/silent→message/log for clarity
- Remove scheduled task special-casing: userMessage now sent for all contexts
- Update schema, tool, and CLAUDE.md descriptions to be clear and
  non-contradictory about communication mechanisms
- Use full tool name mcp__nanoclaw__send_message in docs
- Change schedule_task target_group to accept JID instead of folder name
- Only show target_group_jid parameter to main group agents
- Add defense-in-depth sanitization and error callback to exec() in shutdown
- Use "user or group" consistently (supports both 1:1 and group chats)

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

container/agent-runner/src/index.ts

@@ -18,7 +18,7 @@ interface ContainerInput {
 }
 
 interface AgentResponse {
-  status: 'responded' | 'silent';
+  outputType: 'message' | 'log';
   userMessage?: string;
   internalLog?: string;
 }
@@ -26,21 +26,21 @@ interface AgentResponse {
 const AGENT_RESPONSE_SCHEMA = {
   type: 'object',
   properties: {
-    status: {
+    outputType: {
       type: 'string',
-      enum: ['responded', 'silent'],
-      description: 'Use "responded" when you have a message for the user. Use "silent" when the messages don\'t require a response (e.g. the conversation is between other people and doesn\'t involve you, or no trigger/mention was directed at you).',
+      enum: ['message', 'log'],
+      description: '"message": the userMessage field contains a message to send to the user or group. "log": the output will not be sent to the user or group.',
     },
     userMessage: {
       type: 'string',
-      description: 'The message to send to the user. Required when status is "responded".',
+      description: 'A message to send to the user or group. Include when outputType is "message".',
     },
     internalLog: {
       type: 'string',
-      description: 'Optional internal note about why you chose this status (for logging, not shown to users).',
+      description: 'Information that will be logged internally but not sent to the user or group.',
     },
   },
-  required: ['status'],
+  required: ['outputType'],
 } as const;
 
 interface ContainerOutput {
@@ -254,7 +254,7 @@ async function main(): Promise<void> {
   // 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${input.prompt}`;
+    prompt = `[SCHEDULED TASK - The following message was sent automatically and is not coming directly from the user or group.]\n\n${input.prompt}`;
   }
 
   try {
@@ -294,13 +294,13 @@ async function main(): Promise<void> {
       if (message.type === 'result') {
         if (message.subtype === 'success' && message.structured_output) {
           result = message.structured_output as AgentResponse;
-          log(`Agent result: status=${result.status}${result.internalLog ? `, log=${result.internalLog}` : ''}`);
+          log(`Agent result: outputType=${result.outputType}${result.internalLog ? `, log=${result.internalLog}` : ''}`);
         } else if (message.subtype === 'error_max_structured_output_retries') {
           // Agent couldn't produce valid structured output — fall back to text result
           log('Agent failed to produce structured output, falling back to text');
           const textResult = 'result' in message ? (message as { result?: string }).result : null;
           if (textResult) {
-            result = { status: 'responded', userMessage: textResult };
+            result = { outputType: 'message', userMessage: textResult };
           }
         }
       }
@@ -309,7 +309,7 @@ async function main(): Promise<void> {
     log('Agent completed successfully');
     writeOutput({
       status: 'success',
-      result: result ?? { status: 'silent' },
+      result: result ?? { outputType: 'log' },
       newSessionId
     });