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A real Euler-Bernoulli beam-bending hero, a real Knuth-Plass line-breaker, and a real nine-part margin canon — a bookshop, not a decoration. The hero evaluates the actual Euler-Bernoulli cantilever beam deflection equation per fragment, fanning twelve leaves from a shared stiffness coefficient. A line-breaking demonstrator runs the genuine adjustment-ratio, badness, and demerits dynamic program TeX itself uses, and a live nine-part 'secret canon' margin construction works real 9x9 grid-division geometry across Editions and Bindings custom post types.