Was macht youtube-channel-research?
Batch-research the latest 1–N videos of a YouTube channel and produce ONE cross-video comparative report (not N isolated summaries) — enumerate uploads, fetch text with captions first and local ASR as fallback, then write up themes, drift, contradictions and limits. 批量研究 YouTube 频道最近的 1 至 N 个视频：枚举投稿、逐视频取文本（字幕优先、无字幕自动 ASR 转写），再横向对比成文，产出跨视频研究报告。Trigger phrases / 触发词：研究这个YouTube频道, 频道最近的视频, 批量总结YouTube, youtube频道调研, 这个频道最近N个视频讲了什么, 频道内容分析, 竞品频道追踪, youtube 批量字幕/转录, youtube channel research, latest v