feat: add PDF generation tooling

.gitignore

@@ -14,3 +14,7 @@ assets/
 
 # Local reference material — not for distribution
 .reference/
+
+# PDF build artifacts
+book-combined.md
+claude-code-from-source.pdf

.md-to-pdf.config.js

@@ -0,0 +1,32 @@
+const path = require('path');
+
+const CHROME_PATHS = {
+  darwin: '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome',
+  win32:  'C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe',
+  linux:  '/usr/bin/google-chrome',
+};
+
+const executablePath = process.env.CHROME_PATH || CHROME_PATHS[process.platform];
+
+module.exports = {
+  stylesheet: [path.resolve(__dirname, 'book-style.css')],
+  body_class: 'book',
+  highlight_style: 'atom-one-dark',
+  launch_options: {
+    executablePath,
+    args: ['--no-sandbox', '--disable-setuid-sandbox'],
+  },
+  pdf_options: {
+    format: 'Letter',
+    margin: {
+      top: '0.85in',
+      right: '0.85in',
+      bottom: '0.9in',
+      left: '0.9in',
+    },
+    printBackground: true,
+    displayHeaderFooter: true,
+    headerTemplate: `<div style="font-size:7pt; font-family:'Inter',sans-serif; color:#bbb; width:100%; text-align:center; padding-top:0.35in; letter-spacing:1px;">CLAUDE CODE FROM SOURCE</div>`,
+    footerTemplate: `<div style="font-size:7pt; font-family:'Inter',sans-serif; color:#aaa; width:100%; text-align:center; padding-bottom:0.35in;"><span class="pageNumber"></span></div>`,
+  },
+};

Makefile

@@ -0,0 +1,20 @@
+.PHONY: pdf clean-pdf help
+
+## Generate the book as a PDF (output: claude-code-from-source.pdf)
+pdf:
+	@command -v md-to-pdf >/dev/null 2>&1 || { echo "Installing md-to-pdf..."; npm install -g md-to-pdf; }
+	@echo "Building book-combined.md..."
+	@node scripts/build-pdf.js
+	@echo "Rendering PDF..."
+	@md-to-pdf --config-file .md-to-pdf.config.js book-combined.md
+	@mv book-combined.pdf claude-code-from-source.pdf
+	@echo "✔ claude-code-from-source.pdf"
+
+## Remove generated PDF artifacts
+clean-pdf:
+	@rm -f book-combined.md claude-code-from-source.pdf
+	@echo "✔ cleaned"
+
+## Show available targets
+help:
+	@grep -E '^##' Makefile | sed 's/## /  /'

README.md

@@ -94,6 +94,25 @@ Every chapter has layered depth: a narrative flow for technical leaders, deep-di
 
 ---
 
+## Generate the PDF
+
+You can render the entire book as a styled PDF locally:
+
+```bash
+# Requires Node.js and Google Chrome installed
+make pdf
+```
+
+This runs `scripts/build-pdf.js` to assemble all chapters into a single document (with cover page, table of contents, and part dividers), then uses [`md-to-pdf`](https://github.com/simonhaenisch/md-to-pdf) to render it via headless Chrome.
+
+The output is `claude-code-from-source.pdf` in the repo root. If Chrome is not at the default path for your OS, set `CHROME_PATH`:
+
+```bash
+CHROME_PATH="/path/to/chrome" make pdf
+```
+
+---
+
 ## The 10 Patterns That Make It Work
 
 If you read nothing else: