refactor(readability): Wave D ddt — decompose SL update_pre_solve and dedupe the five DDt flavors (D-46..D-56)#343

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Commits on Jul 7, 2026

refactor(ddt): D-53/READ-90 — hoist redundant inline imports to module scope
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refactor(ddt): D-47/READ-18 — single _to_nondim_ndarray helper for the unwrap dance
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refactor(ddt): D-48/READ-19 — extract _velocity_nd_at for the trace-back velocity legs
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refactor(ddt): D-46/READ-17 — decompose SemiLagrangian.update_pre_solve into phase helpers
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refactor(ddt): D-49/READ-20 — extract _DDtBase for the quintuplicated flavor boilerplate
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refactor(ddt): D-51/READ-47 — explicit dispatch in Eulerian.update_history_fn
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refactor(ddt): D-52/READ-87 — rename SL working variable, drop leaked loop index
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refactor(ddt): D-54/READ-92 — narrow the register_remesh_hook excepts and state the tolerated failure
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docs(ddt): D-56/READ-91 — state Symbolic's interface-parity-only parameters
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docs(ddt): TODO(BUG) marker at _to_nondim_ndarray for the pint.Quantity non_dimensionalise crash (#328)
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