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e4a2e40a82
Builds on the PR #1957 merge (Zeljko's Vol1 layout), otherwise byte-for-byte his version: - Remove the end-of-chapter research-questions callouts from all chapters. - ml_ops correction-cascade figure: keep Zeljko's Model A-D chain TikZ drawing, and rewrite the caption, alt-text, and lead-in to describe the chain (they carried a stale 'timeline' description that no longer matched the figure), plus an operations-impact line. - Standardize the matplotlib figure font on a bundled TeX Gyre Heros (a free, redistributable Helvetica-metric clone) registered at runtime in book/tools/figures/style.py, so figures render with a real bold identically on macOS, Linux, and CI instead of falling back to DejaVu Sans or an unreachable macOS .ttc bold face.
Bundled figure font — TeX Gyre Heros
texgyreheros-*.otf are the TeX Gyre Heros faces (a free, Helvetica-metric
sans-serif), bundled so matplotlib renders book figures in a consistent
Helvetica-clone with a real bold on every platform (local macOS, local
Linux, CI container) regardless of installed system fonts. Registered at
runtime by book/tools/figures/style.py.
License: GUST Font License (GFL) — freely redistributable. Source: TeX Gyre project (GUST), also shipped with TeX Live / TinyTeX.