Restore older, more detailed FusionScale4D figure as an additional ancillary figure

[ajsteinmetz]

The current anc/TikZ/FusionScale4D.tex (and its art/FusionScale4D.tex README variant) is a simplification of an earlier, more technically detailed version of this "process scale" figure found in _supplemental/_old.tex of the parent aneutronic-fusion repo (the \label{fig:ProcessScale} figure in the "Confinement Time" appendix), from which this repo was formed.

That older version distinguishes several manmade facilities that the current figure has since merged/dropped:

• Separate bubbles/labels for NIF/LMJ (mm³, ns) and the Sandia Z Machine (cm³, ~100 ns) — in the current figure these are commented out and folded into a single combined "ITER / NIF / LMJ" bubble/label.
• A separate IEC fusor bubble (~0.1 m³, ~1 s) — commented out entirely in the current figure.
• A separate Brown Dwarfs bubble (10 kyr–10 Myr, 10²³ m³) distinct from stellar cores — commented out in the current figure.
• The original caption's explicit per-facility volume/time callouts (e.g. "NIF/LMJ inertial-confinement (mm³, ns), Z-pinch magnetic-confinement (cm³, ~100 ns)...").

Old-version source (_supplemental/_old.tex, \begin{tikzpicture}[x=1cm,y=1cm] under \section{Confinement Time}):

% NIF / LMJ (mm^3, ns)
\fill[red!20]  (2.33,2.0)  circle[radius=0.60];
% Sandia Z Machine (cm^3, ~100 ns)
\fill[red!20]  (2.67, 2.56)  circle[radius=0.30];
...
% IEC fusor (100 cm^3, ms-s)
%\fill[red!20] (5.0,2.60) circle[radius=0.50];
...
% Brown dwarfs (10 kyr-10 Myr, 10^23 m^3)
\fill[blue!20] (9.5,5.56)  circle[radius=0.6];
...
\node[align=center,scale=1.0] at (2.33,2.00) {NIF\\LMJ};
\node[align=center,scale=1.0] at (2.67, 2.56) {Z};
...
\node[align=center] at (9.5,5.56) {\small{Brown}\\\small{Dwarfs}};

with caption:

Schematic phase space of aneutronic (blue) and neutron-producing (red) nuclear fusion environments, plotted as characteristic fusion burn volume (V) vs characteristic process (confinement/burn) time (\Delta t)... For manmade processes, we illustrate the ITER tokamak ((\sim10^{3},\text{m}^{3}), hundreds of seconds), NIF/LMJ inertial-confinement ((\text{mm}^{3}), ns), Z-pinch magnetic-confinement ((\text{cm}^{3}), (\sim100,\text{ns})), muon-catalyzed fusion ((\text{cm}^{3}), \textmu s muon-lifetime-limited), and laser nano-target (p^{11}\text{B}) targets and plasmonic concepts (nm–\textmu m scales, fs–ns pulses).

Fix

Add this older, more granular version of the figure as an additional ancillary figure in anc/TikZ/ (converted to the current standalone documentclass[tikz,border=2pt]{standalone} + \pagecolor{white} convention used elsewhere in anc/TikZ/, see #15), alongside the current consolidated FusionScale4D.tex, so the individually-labeled NIF/LMJ, Z-pinch, IEC fusor, and Brown Dwarf regions are preserved for readers who want the finer-grained breakdown.