Major content expansion: Module 26 split, 9 new sections, 10 appendices, cross-references, illustrations

- Split Module 26 into 3 modules: 26 (Production Engineering), 27 (Safety/Ethics/Regulation), 28 (Strategy/Product/ROI)
- Added 9 Tier 1 new sections: 8.5, 9.4, 10.5, 12.7, 18.5, 21.5, 22.4, 23.4, 25.8
- Created 10 appendices (A-J): Math Foundations, ML Essentials, Python, Environment Setup, Git, Glossary, Hardware, Model Cards, Prompt Templates, Datasets
- Consolidated agents from 47 to 42 (merged overlapping roles)
- Added/upgraded 9 inline SVG diagrams across Modules 09, 23, 24
- Added cross-reference hyperlinks across all 150+ section files
- Tier 2 (20 items) and Tier 3 (18 items) content expansions complete
- Updated all index/ToC files for new book structure (29 modules)
- Added 8 SVG callout icons and CSS integration
- Updated team.html to reflect 42-agent pipeline
- Added agent skills backup under agents/skills-backup-2026-03-27/

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: apartsin

agents/00-chapter-lead.html

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agents/01-curriculum-alignment.html

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agents/02-deep-explanation.html

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agents/03-teaching-flow.html

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agents/04-student-advocate.html

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agents/05-cognitive-load.html

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agents/06-example-analogy.html

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agents/07-exercise-designer.html

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agents/08-code-pedagogy.html

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agents/09-visual-learning.html

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