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verification: Euler columns and Bryan's plate in buckling steps

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buckle-euler-pinned and buckle-euler-cantilever (hex20 columns, −0.18 % from Euler with
Engesser's shear correction) and buckle-plate-square (a simply supported square plate, b/t =
100, −0.39 % from k = 4; the support and thickness choices in its README). ROADMAP and parity
updated, docs/oracle.md regenerated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo
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jyvikoandClaude Opus 5.5 authored and Irakli Kourtis committed 2026-10-14 13:30:59 -04:00
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tests/oracle/buckle-euler-pinned/README.md
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# Euler buckling of a pinned column of solids
A pinned–pinned square column, length 20, side 1, E = 1000, ν = 0, modelled as its half with a
symmetry plane at midspan (2 × 2 × 10 hex20). The pinned end is held laterally over its face,
which leaves its rotation free, and pressed by a unit pressure; the first load factor is the
buckling stress. Reference: Euler with Engesser's shear correction.