UTFANSWF v23 third-party runtime notice

Bundled package: mpmath 1.3.0
License: BSD
Purpose: high-precision 6x6 Majorana eigen-spectrum calculation in Row 0.4.
Source/project: https://mpmath.org/
License text: third_party/mpmath/LICENSE.txt

The bundled copy is included so the canonical command can execute Row 0.4
without requiring a separate mpmath installation or network access.
