Explicit dynamics core: central differences, one-point hex8 with hourglass control, nodal-pressure tet4, solve.explicit (M10 X1) (#27)

* Model: explicit dynamic steps (end time, increment scale and cap, output intervals, initial velocities, rigid walls, hourglass and bulk viscosity controls); deck writers refuse them

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

* fem: uniform-strain hex8 and tet4 kinematics, Flanagan–Belytschko hourglass shape vectors, element frequency bound

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

* Explicit solver crate (L2): central differences with lumped mass, one-point hex8 with Flanagan–Belytschko hourglass control, Bonet–Burton tet4, bulk viscosity, rigid walls, energy account; wave and impact verification

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

* Engine: solve.explicit and solve.history commands, explicit results in the session and solve.probe; cantilever period against the modal solver

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

* Docs: explicit solver in the architecture, roadmap (M10 started), parity and literature (Part H)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

* Simplify: Model::select_step shared by both solvers, Procedure::sets/is_dynamic, fused per-increment passes without allocation, shared element tail, generic command caps

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

* Catalogue: solve.explicit is ready; solve.history beside solve.probe

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

* Rebase onto the implicit couplings work: Procedure is no longer Copy

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

---------

Co-authored-by: jyviko <2501648+jyviko@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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@@ -292,7 +292,13 @@ pub static CATALOGUE: &[Capability] = &[
soon("deck.read", "Read Deck", Solve, "Decks", "M9", "Read a deck, keeping keywords ModelCraft does not know"),
ready("solve.static", "Static", Solve, "Implicit", "Linear static solve of a step with ModelCraft's own solver"),
ready("solve.frequency", "Frequency", Solve, "Implicit", "Natural frequencies and mode shapes of a frequency step"),
soon("solve.explicit", "Explicit", Solve, "Explicit", "M10", "Explicit dynamics: central differences, contact, erosion"),
ready(
"solve.explicit",
"Explicit",
Solve,
"Explicit",
"Transient dynamics of an explicit step by central differences (contact and erosion coming in M10)",
),
soon("solve.blast", "Blast & Impact", Solve, "Explicit", "M14", "EOS-driven fluids with fluid–structure contact (ALE or SPH)"),
soon("solve.flow", "Lattice Boltzmann", Solve, "Fluids", "M12", "Lattice Boltzmann flow on the CPU or the GPU"),
soon("solve.fsi", "Fluid–Structure", Solve, "Fluids", "M13", "Coupled fluid and structure solve"),
@@ -301,7 +307,14 @@ pub static CATALOGUE: &[Capability] = &[
soon("results.contour", "Contours", Results, "Display", "M4", "Contour plots of stress, strain and displacement"),
soon("results.modes", "Mode Shapes", Results, "Display", "M4", "Mode shapes of a frequency step"),
soon("results.animate", "Animate", Results, "Display", "M9", "Animate modes and time histories"),
ready("solve.probe", "Probe", Results, "Query", "Displacement, reaction and stress at nodes, or a mode shape"),
ready_more(
"solve.probe",
"Probe",
Results,
"Query",
"Displacement, reaction and stress at nodes, a mode shape, or an explicit field frame",
&["solve.history"],
),
soon("results.reactions", "Reactions", Results, "Query", "M4", "Reaction force and moment sums"),
soon("results.free_body", "Free Body", Results, "Query", "M9", "Free-body forces across a cut"),
soon("results.xy", "XY Plot", Results, "Plots", "M9", "Plot a quantity against time or another"),