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%% STATUS: HISTORICAL
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\section*{C\,$\leftrightarrow$\,Isabelle Refinement Roadmap (Historical)}

A five-phase refinement roadmap, estimated at six to eight months, was drafted
to guide a systematic C\,$\leftrightarrow$\,Isabelle correspondence effort:

\begin{itemize}
  \item \textbf{Phase 1}: Annotate and prove \texttt{vm.c} core interpreter loop.
  \item \textbf{Phase 2}: Extend to utility subsystems (memory, I/O, logging).
  \item \textbf{Phase 3}: Build a proof-aware test harness for regression detection.
  \item \textbf{Phase 4}: Cover the approximately 200 FORTH primitive word implementations.
  \item \textbf{Phase 5}: Ongoing maintenance and extension as new words are added.
\end{itemize}

This roadmap was not followed. The actual formal verification program produced
19 standalone Isabelle/HOL theory files organized by feedback loop and word
category, subsequently expanded to 24 files with the ACL proof suite. The
approach differs fundamentally from the inline-annotation methodology this
roadmap proposed. This document is retained as a record of the design path not
taken.
