sympy-rust: Rust port of the sympy/sympy polys-domain kernel
==================================================================

This repository holds a kernel-scoped Rust port of
https://github.com/sympy/sympy (computer algebra system, BSD-3-Clause).

* Upstream authors: the SymPy Development Team
  (https://github.com/sympy/sympy).
* Upstream license: BSD-3-Clause. This port links no upstream code; the
  algorithms reimplemented here (dense polynomial arithmetic over QQ and
  the QQ domain operations) are behavior-checked against upstream by the
  equivalence corpus in `tests/`, not copied from it.
* This port's own code: MIT (see LICENSE). Upstream project names and
  trademarks remain with their owners.

Scope (ADR-048 in rustsmith): dense polys arithmetic over QQ only
(`dup_*`, `dmp_mul`, QQ ops) — the single seam the headroom probe proved
(polys-domains 0.85 rewrite; simplify-core 0.49 upstream_only, out of
scope). Expand only with measured wins.
