%% Vol I, Chapter 3 — Physics-Driven Adaptive Runtime
%% SOURCE: docs/working/architecture/03-architecture/physics-engine/feedback-loops.md
%%         ONTOLOGY.md
%%         docs/working/architecture/03-architecture/adaptive-systems/window-inference-redesign.md
%%         docs/working/architecture/03-architecture/pipelining/wired-not-utilized.md
%%         docs/working/architecture/03-architecture/heartbeat-system/instrumentation-plan.md

\chapter{Physics-Driven Adaptive Runtime}
\label{vol1:chap:physics}

%% TODO(bob): opening paragraph explaining the thermodynamic-modeling-language
%% framing per ONTOLOGY.md. Key calibration: "thermodynamic" is the modeling
%% language, not a physics claim.

\section{Overview: Seven Feedback Loops}
\label{vol1:sec:physics:overview}

%% TODO(bob): promote the loop-summary table from feedback-loops.md into a
%% formal \begin{table}...\end{table} here. Seven rows, one per loop.

\section{Loop \#1 — Execution Heat}
\label{vol1:sec:physics:loop1}

%% SOURCE: docs/working/architecture/03-architecture/physics-engine/feedback-loops.md
%%         src/dictionary_heat_optimization.c
%% TODO(bob): describe the frequency counter per word, the WORD_FROZEN and
%% WORD_PINNED flags, and the hot-words cache (ENABLE_HOTWORDS_CACHE=1).
%% Cite proof/StarForth_Loop1_Heat.thy.

\section{Loop \#2 — Rolling Window of Truth}
\label{vol1:sec:physics:loop2}

%% SOURCE: src/rolling_window_of_truth.c, feedback-loops.md
%% TODO(bob): describe the circular buffer, double-buffered snapshots, and
%% adaptive sizing. Key struct: RollingWindowOfTruth.

\section{Loop \#3 — Linear Decay}
\label{vol1:sec:physics:loop3}

%% SOURCE: feedback-loops.md, docs/working/scratch/src/internal/PHASE_2A_COMPLETION_REPORT.adoc
%% TODO(bob): describe quiescent word heat decay over time; WORD_FROZEN
%% semantics (does not decay at all).

\section{Loop \#4 — Word Transition Prediction (Pipelining)}
\label{vol1:sec:physics:loop4}

%% SOURCE: src/physics_pipelining_metrics.c
%%         docs/working/architecture/03-architecture/pipelining/wired-not-utilized.md
%% TODO(bob): describe the word-to-word transition matrix and prefetch
%% mechanism. IMPORTANT FLAG: per wired-not-utilized.md, the
%% decision/speculation logic is currently wired but not called.
%% Describe the implemented state accurately, and note what remains pending.

\section{Loop \#5 — Window Width Inference}
\label{vol1:sec:physics:loop5}

%% SOURCE: src/inference_engine.c
%%         docs/working/architecture/03-architecture/adaptive-systems/window-inference-redesign.md
%% TODO(bob): describe Levene's test on disjoint chunks + binary-chop
%% mechanism from the approved redesign doc.

\section{Loop \#6 — Decay Slope Inference}
\label{vol1:sec:physics:loop6}

%% SOURCE: src/inference_engine.c, feedback-loops.md
%% TODO(bob): describe the exponential-regression mechanism for tuning
%% the Loop \#3 decay slope.

\section{Loop \#7 — Adaptive Heartrate}
\label{vol1:sec:physics:loop7}

%% SOURCE: HeartbeatState in include/vm.h, feedback-loops.md
%%         docs/working/architecture/03-architecture/heartbeat-system/instrumentation-plan.md
%% TODO(bob): describe the HeartbeatState tick coordinator, DoE observation
%% counters, L8 bucket stats, and M5 time trust. Note that HeartbeatTickSnapshot
%% and tick_buffer are declared in include/vm.h, but heartbeat_export_csv()
%% is not yet implemented.

\section{L8 Jacquard Mode Selector}
\label{vol1:sec:physics:l8}

%% SOURCE: src/ssm_jacquard.c
%%         docs/working/architecture/03-architecture/physics-engine/ssm-raw-data-analysis.md
%% TODO(bob): describe the six L8 Jacquard modes (stable, volatile, diverse,
%% temporal, transition, omni), the attractor-bucket mechanism, and the
%% vm->ssm_l8_state field. Distinguish L8 from the seven loops (L8 is a
%% meta-coordinator, not a loop).

\section{Determinism and Formal Properties}
\label{vol1:sec:physics:determinism}

%% TODO(bob): 0\% algorithmic variance claim from the 90-run DoE.
%% Cite james:2025:ssrn and the relevant Isabelle proofs.
%% Source: docs/working/papers/NULL_HYPOTHESIS.md for falsification framing.

\section{Hot-Words Cache Optimization}
\label{vol1:sec:physics:hotwords}

\input{../scraps/experiments/02-experiments/physics-optimization/hotwords-cache}

\section{Optimization Proposals}
\label{vol1:sec:physics:proposals}

\input{../scraps/experiments/02-experiments/physics-optimization/proposals}