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- 新增 _req_safe():API 错误返回 None 而非 sys.exit(1) - blocked_check / _unblock_issues_blocked_by / _get_blocking_refs 改用 _req_safe - API 失败时保守处理:保持 blocked 状态 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>