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Add a new YouTube video to the portfolio. New video becomes Horizontal Video Card 1, all others shift down, oldest goes to More section. Use when user types /add-video followed by a YouTube URL.

Generate `resume.pdf` from `resume.html` and verify whether the checked-in PDF is stale. Use when the user types `/resume`, asks to regenerate the resume PDF, or wants to check whether `resume.pdf` matches the current HTML.