Description of files:

./enigma-example-context.tex    usage example for Context
./enigma-example-latex.tex      usage example for LaTeX
./enigma-example-plain.tex      usage example for Plain
./COPYING                       License (BSD)
./enigma_manual.tex             manual source (Context)
./enigma-doc.pdf                compiled manual
./mtx-t-enigma.lua              mtx script (run as “mtxrun --script enigma”)
./enigma.lua                    format independent code
./t-enigma.mkvi                 Context interface
./enigma.sty                    wrapper for LaTeX (inputs enigma.tex)
./enigma.tex                    Plain interface

This is the directory layout I have in mind:

enigma_manual.tex          -> ./doc/context/third/enigma/enigma_manual.tex
enigma-example-plain.tex   -> ./doc/context/third/enigma/examples/enigma-example-plain.tex
enigma-example-latex.tex   -> ./doc/context/third/enigma/examples/enigma-example-latex.tex
enigma-example-context.tex -> ./doc/context/third/enigma/examples/enigma-example-context.tex
enigma-doc.pdf             -> ./doc/context/third/enigma/enigma-doc.pdf
COPYING                    -> ./doc/context/third/enigma/COPYING
mtx-t-enigma.lua           -> ./scripts/context/lua/third/enigma/mtx-t-enigma.lua
t-enigma.mkvi              -> ./tex/context/third/enigma/t-enigma.mkvi
enigma.sty                 -> ./tex/latex/enigma/enigma.sty
enigma.tex                 -> ./tex/plain/enigma/enigma.tex
enigma.lua                 -> ./tex/generic/enigma/enigma.lua