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Build and maintain a semester-long Obsidian course vault with course overviews, lesson notes, concept pages, graph hubs, replay-sync trackers, and replay-to-note workflows. Use when Codex needs to manage course knowledge in Obsidian, especially when BUAA replay artifacts should become structured lesson notes rather than raw transcripts.

Extract BUAA classroom replay artifacts from `livingroom` or `coursedetail` URLs by reusing a local Chromium login session. Use when Codex needs replay metadata, course-transcript files, optional PPT auxiliary artifacts, replay-ready lesson lists, or a standalone semantic rebuild packet / final lesson note.