refactor(core,cli)!: rename SubAgentScope to AgentHeadless

- Rename SubAgentScope → AgentHeadless and runNonInteractive → execute
- Move agents-collab/ into agents/ with new runtime/ subdirectory
- Split subagent.ts into agent-core.ts and agent-headless.ts
- Update all event types, emitters, and statistics classes

BREAKING CHANGE: SubAgentScope renamed to AgentHeadless;
runNonInteractive() renamed to execute()

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

packages/cli/src/ui/components/subagents/runtime/AgentExecutionDisplay.tsx

@@ -8,7 +8,7 @@ import React, { useMemo } from 'react';
 import { Box, Text } from 'ink';
 import type {
   TaskResultDisplay,
-  SubagentStatsSummary,
+  AgentStatsSummary,
   Config,
 } from '@qwen-code/qwen-code-core';
 import { theme } from '../../../semantic-colors.js';
@@ -467,7 +467,7 @@ const ExecutionSummaryDetails: React.FC<{
  * Tool usage statistics component
  */
 const ToolUsageStats: React.FC<{
-  executionSummary?: SubagentStatsSummary;
+  executionSummary?: AgentStatsSummary;
 }> = ({ executionSummary }) => {
   if (!executionSummary) {
     return (