%% SCRAP: architecture/03-architecture/README
%% SOURCE: docs/working/architecture/03-architecture/README.md
%% STATUS: SUPERSEDED
%% FITS: dev-guide/ch-overview
%% EDITORIAL: lifted — prose rewritten to press voice

\section{Architecture: Subsystem Index}

%% This source is a directory-index README. Its substantive content — the
%% three-layer model, core components, the physics innovation, and the
%% roadmap — is fully covered by the Architecture Overview scrap, which
%% supersedes it. Retained here as a brief subsystem signpost.

StarForth's architecture documentation covers the core subsystems and the path
toward StarKernel and StarshipOS. The subsystems are the Hardware Abstraction
Layer (which enables the StarForth $\rightarrow$ StarKernel $\rightarrow$
StarshipOS progression), the heartbeat system (the centralized time-based
tuning coordinator), the physics engine (the physics-driven adaptive runtime),
the pipelining subsystem (speculative execution via word-transition
prediction), and the adaptive systems (window inference and decay algorithms).

The architecture rests on three layers --- the platform-agnostic VM and physics
subsystems, the HAL, and the platform implementation (Linux, L4Re, or kernel).
Its defining feature is a physics-grounded, self-adaptive runtime with formally
proven deterministic behavior: 0\% algorithmic variance across 90 experimental
runs. The full treatment, including the four-phase roadmap, appears in the
Architecture Overview chapter.

%% TODO(bob): this index README duplicates OVERVIEW. Confirm it can be dropped from the formal set rather than carried as a standalone section, and redirect its subsystem links to the promoted formal chapters.