refactor: 移除 ccw cli 内部超时参数，改由外部 bash 控制

- 移除 --timeout 命令行选项和内部超时处理逻辑
- 进程生命周期跟随父进程（bash）状态
- 简化代码，超时控制交由外部调用者管理

ccw/src/cli.ts

@@ -177,7 +177,7 @@ export function run(argv: string[]): void {
     .option('--model <model>', 'Model override')
     .option('--cd <path>', 'Working directory')
     .option('--includeDirs <dirs>', 'Additional directories (--include-directories for gemini/qwen, --add-dir for codex/claude)')
-    .option('--timeout <ms>', 'Timeout in milliseconds (0=disabled, controlled by external caller)', '0')
+    // --timeout removed - controlled by external caller (bash timeout)
     .option('--stream', 'Enable streaming output (default: non-streaming with caching)')
     .option('--limit <n>', 'History limit')
     .option('--status <status>', 'Filter by status')