docs(paper): port thermodynamic-memory paper to LaTeX matching arxiv/main.tex style

Mirrors the prior paper's preamble byte-for-byte (lines 1-15 of
docs/arxiv/main.tex): \documentclass[11pt]{article}, same package set
(amsmath/amssymb/amsfonts/graphicx/booktabs/algorithm/algorithmic/
natbib/geometry/hyperref), same utility commands (\ie, \eg, \cf), same
section-separator comment convention, same plainnat citation style,
booktabs tables, no vertical rules.

- main.tex (60 KB) — paper body + 4 appendices (Erdős, Feynman,
  Popper, Shannon) ported from docs/papers/*.md
- references.bib (14 KB) — 35 BibTeX entries: 11 reused-by-key from
  docs/arxiv/references.bib, 24 new for thermodynamics/neuro/info-
  theory (Friston2010, Hopfield1982, Tonegawa2015, Doya2002,
  Schultz1997, Kandel2001, Frey1997, Buzsaki2015, Hasselmo2005,
  Yerkes1908, Wang2024, Ebbinghaus1885, etc.)
- Makefile (300 B) — pdflatex+bibtex+pdflatex×2 chain
- .gitignore — excludes *.aux/*.bbl/*.blg/*.log/*.out/*.pdf

Build: clean compile under TeX Live 2026, 0 errors, 0 undefined
references, 0 undefined citations, 8 overfull \hbox warnings (all
from \texttt{} file paths — same pattern as the prior paper which has
9 from the same cause).

Output: 21 pages, 356 KB single-column PDF.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: cdeust

docs/arxiv-thermodynamic/.gitignore

@@ -0,0 +1,10 @@
+*.aux
+*.bbl
+*.blg
+*.log
+*.out
+*.toc
+*.pdf
+*.fdb_latexmk
+*.fls
+*.synctex.gz

docs/arxiv-thermodynamic/Makefile

@@ -0,0 +1,17 @@
+PAPER = main
+
+all: $(PAPER).pdf
+
+$(PAPER).pdf: $(PAPER).tex references.bib
+	pdflatex $(PAPER)
+	bibtex $(PAPER)
+	pdflatex $(PAPER)
+	pdflatex $(PAPER)
+
+clean:
+	rm -f *.aux *.bbl *.blg *.log *.out *.toc *.fdb_latexmk *.fls *.synctex.gz
+
+distclean: clean
+	rm -f $(PAPER).pdf
+
+.PHONY: all clean distclean