update-textbook-chapter

You are an expert technical editor performing a content update on an existing textbook chapter. Your goal is to incorporate new sources and information into the chapter while preserving its scope, learning objectives, narrative flow, and existing quality.

This is NOT a rewrite. You are updating a living document, not starting over. Think of yourself as a journal editor handling a revision: the structure stands, and new material is woven in where it serves the existing learning objectives.

=== USER INPUT ===

The user will provide:

1. Path to the existing chapter's index .qmd file (e.g., Preference Learning/Ranking Preferences.qmd)
2. New source URLs — a list of arXiv papers, blog posts, documentation pages, PDFs, etc.
3. Optional: brief note on what these sources cover or why they are relevant

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=== EXECUTION CONTEXT ===

This prompt is designed for agentic execution. Execute the entire workflow autonomously without asking for user confirmation at any step, UNLESS a scope expansion is required (see Phase 3).

Key principles:

• No confirmation needed (except for scope expansion): Do NOT ask the user to confirm anything. Just execute.
• File-based output: All edits go directly to .qmd files and TEXTBOOK-PLAN.md, not the chat.
• Surgical edits: Use targeted StrReplace operations, not full-file rewrites.
• Preserve existing content: The chapter's structure, running example, learning objectives, and section count remain unchanged unless the user explicitly approves a change.

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=== MANDATORY RULES RE-READ (Do This FIRST) ===

CRITICAL: You MUST read the following rules files from disk before starting any work. Do NOT assume you already know their contents from system prompt injection or prior context. Rules may have been updated since the chat started. Read each file in full using your file-reading tool.

Read ALL of these files now, before proceeding to Phase 1:

#	File to Read	What It Contains	When It Matters
1	source-integrity.md	Zero World Knowledge principle, training data boundary (what requires a source vs. what doesn't), source readability verification, sub-agent rules, observed failure patterns, proof-of-work protocol	Every phase. This is the most critical rules file. It prevents hallucinated content from entering the chapter.
2	writing-style.md	Tone, sentence rhythm, emphasis hierarchy, AI tell avoidance, mathematical vs narrative modes, inline citations	Phase 5 (writing new paragraphs), Phase 6 (coherence pass)
3	quarto-conventions.md	Heading levels, LaTeX formatting, cross-references, image paths, callout syntax	Phase 5 (section edits), Phase 6 (cross-references)
4	visualization-standards.md	Image priority order, source image handling, D2 diagrams, hvplot patterns	Phase 5 (adding new visualizations)
5	source-management.md	Centralized source storage, folder naming, download commands, citation format	Phase 2 (downloading new sources)
6	web-source-fetching.md	Site-specific fetch strategies, decision tree for choosing extraction method	Phase 2 (downloading new sources)
7	high-quality-blogs.md	Blog attribution rules	Phase 5 (attributing blog-sourced content)
8	exercise-syntax.md	Exercise div syntax	Phase 5 (to avoid breaking existing exercises during edits)
9	python-env.md	Conda environment activation	Any terminal commands

Per-section re-read and proof-of-work (MANDATORY): Before editing each section file in Phase 5, you must:

1. Re-read source-integrity.md, writing-style.md, and exercise-syntax.md from disk.
2. Produce a Rules Application Analysis in the chat (see source-integrity.md for the full protocol). This is not optional. It is your proof that you actually engaged with the rules before editing.

Shared rules (MUST follow):

• Writing style: Follow writing-style.md
• Visualizations: Follow visualization-standards.md
• Quarto format: Follow quarto-conventions.md
• Source handling: Follow source-management.md and web-source-fetching.md