Shells and beams: MITC4/MITC3 shells, Timoshenko beams, six-DOF nodes (M4) (#47)

* fem: MITC4/MITC3 flat shells and Timoshenko beams with profile properties (ElementDofs STRUCTURAL)

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

* solver: shells and beams on the DofLayout beside solids, 2D elements and trusses; analytic verification and tagged benchmarks

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

* engine: probe rotations, reaction moments and shell and beam element results; docs for shells and beams

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

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Co-authored-by: jyviko <[email protected]>
Co-authored-by: Claude Opus 5.5 <[email protected]>
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@@ -135,7 +135,7 @@ shown greyed with the roadmap milestone that brings them (ROADMAP.md).
| Display | Contours — Contours of displacement and stress, with a legend | ready | `results.contour` |
| Display | Mode Shapes — Mode shapes and frequencies of a frequency step | ready | `results.modes` |
| Display | Animate — Animate the deformed shape, a mode or an explicit step's frames | ready | `results.animate`, `results.frame` |
| Query | Probe — Displacement, reaction and stress at nodes, a mode shape, or an explicit field frame (or click the model) | ready | `solve.probe`, `solve.history` |
| Query | Probe — Displacement, rotation, reaction and stress at nodes, element section forces, a mode shape, or an explicit field frame (or click the model) | ready | `solve.probe`, `solve.history` |
| Query | Reactions — Reaction force and moment sums per set | ready | `results.reactions` |
| Query | Free Body — Free-body forces across a cut | coming soon (M9) | |
| Plots | XY Plot — Plot a quantity against time or another | coming soon (M9) | |