feat: category tags (design/film/photo/text) on the portfolio index
new categories taxonomy, multi-value per project. shown inline in each ls row as [tag] after the slug, muted like the other row metadata and inverting with it on hover/select. reuses the existing shared taxonomy template, so /categories/ and /categories/<tag>/ come for free as browsable archives in the same shell style already used for schools/degrees/semesters.\n\nassigned by medium: design for anything with plans/models, film for the two video projects, photo for the trieste study trip, text alongside design for translation (collage + accompanying theoretical text).
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