Capture knowledge from any URL or PDF into the Obsidian vault as a linked note. Use when the user says "save this URL", "capture this to vault", "add to obsidian", "save this tweet", "capture this article", "capture this PDF", or provides a URL/file path and asks to save, store, or capture it. Routes tweets (x.com, twitter.com) via bird CLI, PDFs via pdftotext, and any other web page via playbooks.