feat(tinytorch): add PDF downloads with 'From Tensors to Systems' subtitle

- Add download links for Guide and Paper PDFs to top navigation bar
- Create manual GitHub Actions workflow for PDF builds (tinytorch-build-pdfs.yml)
- Update title page with 'From Tensors to Systems' in companion box
- Add make targets: paper, downloads
- Include built PDFs in _static/downloads/ for website deployment

.github/workflows/tinytorch-build-pdfs.yml

@@ -0,0 +1,127 @@
+name: 📚 TinyTorch Build PDFs
+
+# =============================================================================
+# Manual PDF Build Workflow
+# =============================================================================
+# This is a manual-only workflow for building TinyTorch PDFs.
+# It does NOT affect the main site deployment.
+#
+# Use: Actions → TinyTorch Build PDFs → Run workflow
+# =============================================================================
+
+on:
+  workflow_dispatch:
+    inputs:
+      build_guide:
+        description: 'Build Course Guide PDF'
+        required: true
+        type: boolean
+        default: true
+      build_paper:
+        description: 'Build Research Paper PDF'
+        required: true
+        type: boolean
+        default: true
+
+jobs:
+  build-pdf-guide:
+    name: '📚 Build Course Guide'
+    runs-on: ubuntu-latest
+    if: inputs.build_guide
+
+    steps:
+      - name: 📥 Checkout
+        uses: actions/checkout@v4
+
+      - name: 🐍 Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+          cache: 'pip'
+          cache-dependency-path: 'tinytorch/site/requirements.txt'
+
+      - name: 📦 Install dependencies
+        working-directory: tinytorch
+        run: |
+          pip install --upgrade pip
+          pip install -r site/requirements.txt
+          pip install -e .
+
+      - name: 📚 Generate LaTeX
+        working-directory: tinytorch/site
+        run: |
+          jupyter-book build . --builder latex --config _config_pdf.yml
+          python3 scripts/latex_postprocessor.py
+          cp _static/logos/fire-emoji.png _build/latex/
+          cp _static/logos/logo-mlsysbook.png _build/latex/
+
+      - name: 📚 Compile PDF with XeLaTeX
+        uses: xu-cheng/latex-action@v3
+        with:
+          root_file: tinytorch-course.tex
+          working_directory: tinytorch/site/_build/latex
+          latexmk_use_xelatex: true
+
+      - name: 📤 Upload PDF Guide
+        uses: actions/upload-artifact@v4
+        with:
+          name: TinyTorch-Guide
+          path: tinytorch/site/_build/latex/tinytorch-course.pdf
+          retention-days: 30
+
+  build-pdf-paper:
+    name: '📑 Build Research Paper'
+    runs-on: ubuntu-latest
+    if: inputs.build_paper
+
+    steps:
+      - name: 📥 Checkout
+        uses: actions/checkout@v4
+
+      - name: 📑 Compile Paper with LuaLaTeX
+        uses: xu-cheng/latex-action@v3
+        with:
+          root_file: paper.tex
+          working_directory: tinytorch/paper
+          latexmk_use_lualatex: true
+
+      - name: 📤 Upload PDF Paper
+        uses: actions/upload-artifact@v4
+        with:
+          name: TinyTorch-Paper
+          path: tinytorch/paper/paper.pdf
+          retention-days: 30
+
+  summary:
+    name: '📊 Build Summary'
+    runs-on: ubuntu-latest
+    needs: [build-pdf-guide, build-pdf-paper]
+    if: always()
+
+    steps:
+      - name: 📊 Generate Summary
+        run: |
+          echo "## 📚 TinyTorch PDF Build" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "| PDF | Status |" >> $GITHUB_STEP_SUMMARY
+          echo "|-----|--------|" >> $GITHUB_STEP_SUMMARY
+
+          if [ "${{ inputs.build_guide }}" = "true" ]; then
+            echo "| 📚 Course Guide | ${{ needs.build-pdf-guide.result }} |" >> $GITHUB_STEP_SUMMARY
+          else
+            echo "| 📚 Course Guide | skipped |" >> $GITHUB_STEP_SUMMARY
+          fi
+
+          if [ "${{ inputs.build_paper }}" = "true" ]; then
+            echo "| 📑 Research Paper | ${{ needs.build-pdf-paper.result }} |" >> $GITHUB_STEP_SUMMARY
+          else
+            echo "| 📑 Research Paper | skipped |" >> $GITHUB_STEP_SUMMARY
+          fi
+
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "### 📥 Download" >> $GITHUB_STEP_SUMMARY
+          echo "PDFs are available as artifacts above (valid for 30 days)." >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "To add to the site, download and place in:" >> $GITHUB_STEP_SUMMARY
+          echo "- \`tinytorch/site/_static/downloads/TinyTorch-Guide.pdf\`" >> $GITHUB_STEP_SUMMARY
+          echo "- \`tinytorch/site/_static/downloads/TinyTorch-Paper.pdf\`" >> $GITHUB_STEP_SUMMARY

tinytorch/.gitignore

@@ -200,6 +200,10 @@ docs/chapters/modules/*
 site/_build/
 .envrc
 
+# BUT: Include PDF downloads for the website (shipped with repo)
+!site/_static/downloads/
+!site/_static/downloads/*.pdf
+
 # Generated tinytorch package (auto-generated from src/ via nbdev_export)
 # Single source of truth: src/*/*.py files
 tinytorch/*

tinytorch/site/Makefile

@@ -1,14 +1,16 @@
 # TinyTorch Book Build Makefile
 # Convenient shortcuts for building HTML and PDF versions
 
-.PHONY: help html pdf clean install test restore-emoji
+.PHONY: help html pdf paper downloads clean install test restore-emoji
 
 help:
 	@echo "Tiny🔥Torch Build Commands"
 	@echo "=========================="
 	@echo ""
 	@echo "  make html          - Build HTML version (website)"
-	@echo "  make pdf           - Build PDF via XeLaTeX"
+	@echo "  make pdf           - Build PDF course guide via XeLaTeX"
+	@echo "  make paper         - Build research paper via LuaLaTeX"
+	@echo "  make downloads     - Build both PDFs and copy to assets/downloads/"
 	@echo "  make clean         - Remove all build artifacts"
 	@echo "  make restore-emoji - Restore original markdown files (if build interrupted)"
 	@echo "  make install       - Install Python dependencies"
@@ -79,6 +81,40 @@ restore-emoji:
 	@echo "🔄 Restoring original markdown files..."
 	@python3 scripts/emoji_preprocessor.py --restore
 
+paper:
+	@echo "📑 Building TinyTorch Research Paper via LuaLaTeX..."
+	@echo ""
+	@# Check dependencies
+	@command -v lualatex >/dev/null 2>&1 || { echo "❌ Error: lualatex not found. Install TeX Live from https://www.tug.org/texlive/"; exit 1; }
+	@echo "✅ Dependencies OK"
+	@echo ""
+	@# Build paper
+	@cd ../paper && lualatex -interaction=nonstopmode paper.tex
+	@cd ../paper && bibtex paper 2>/dev/null || true
+	@cd ../paper && lualatex -interaction=nonstopmode paper.tex
+	@cd ../paper && lualatex -interaction=nonstopmode paper.tex
+	@echo ""
+	@# Check if build succeeded
+	@if [ -f "../paper/paper.pdf" ]; then \
+		PDF_SIZE=$$(du -h "../paper/paper.pdf" | cut -f1); \
+		echo "✅ Paper build complete!"; \
+		echo "📄 Output: ../paper/paper.pdf"; \
+		echo "📊 Size: $${PDF_SIZE}"; \
+	else \
+		echo "❌ Paper compilation failed - check errors above"; \
+		exit 1; \
+	fi
+
+downloads: pdf paper
+	@echo ""
+	@echo "📦 Copying PDFs to assets/downloads/..."
+	@mkdir -p _build/html/assets/downloads
+	@cp _build/latex/tinytorch-course.pdf _build/html/assets/downloads/TinyTorch-Guide.pdf
+	@cp ../paper/paper.pdf _build/html/assets/downloads/TinyTorch-Paper.pdf
+	@echo ""
+	@echo "✅ Downloads ready:"
+	@ls -lh _build/html/assets/downloads/
+
 # Default target
 .DEFAULT_GOAL := help
 

tinytorch/site/_config_pdf.yml

@@ -228,15 +228,17 @@ sphinx:
               colframe=bodygray!4,
               boxrule=0pt,
               arc=6pt,
-              width=0.52\textwidth,
+              width=0.58\textwidth,
               halign=center,
               left=24pt,
               right=24pt,
-              top=12pt,
-              bottom=14pt
+              top=14pt,
+              bottom=16pt
             ]
-              {\fontsize{7}{9}\selectfont\color{bodygray!60}The Build-It-Yourself Companion to the\par}
-              \vspace{10pt}
+              {\fontsize{9}{11}\selectfont\color{torchnavy}\textit{From Tensors to Systems}\par}
+              \vspace{8pt}
+              {\fontsize{7}{9}\selectfont\color{bodygray!60}A Build-It-Yourself Companion to the\par}
+              \vspace{8pt}
               {\fontsize{8.5}{11}\selectfont\color{torchnavy}\textbf{Machine Learning Systems} textbook\par}
               \vspace{6pt}
               {\fontsize{7}{9}\selectfont\color{flameorange}\textit{\href{https://mlsysbook.ai}{mlsysbook.ai}}\par}

tinytorch/site/_static/wip-banner.js

@@ -17,6 +17,14 @@ document.addEventListener('DOMContentLoaded', function() {
                     <span class="tinytorch-bar-badge">Under Construction</span>
                 </div>
                 <div class="tinytorch-bar-links">
+                    <a href="_static/downloads/TinyTorch-Guide.pdf" class="download-link" title="Download Course Guide (PDF)">
+                        <span class="link-icon">↓</span>
+                        <span class="link-text">Guide</span>
+                    </a>
+                    <a href="_static/downloads/TinyTorch-Paper.pdf" class="download-link" title="Download Research Paper (PDF)">
+                        <span class="link-icon">↓</span>
+                        <span class="link-text">Paper</span>
+                    </a>
                     <a href="https://mlsysbook.ai" target="_blank">
                         <span class="link-icon">📖</span>
                         <span class="link-text">MLSysBook</span>
@@ -25,11 +33,11 @@ document.addEventListener('DOMContentLoaded', function() {
                         <span class="link-icon">✉️</span>
                         <span class="link-text">Subscribe</span>
                     </a>
-                    <a href="https://github.com/mlsysbook/TinyTorch" target="_blank">
+                    <a href="https://github.com/harvard-edge/cs249r_book" target="_blank">
                         <span class="link-icon">⭐</span>
                         <span class="link-text">Star</span>
                     </a>
-                    <a href="https://tinytorch.ai/join" target="_blank">
+                    <a href="community/?action=join" target="_blank">
                         <span class="link-icon">🌍</span>
                         <span class="link-text">Community</span>
                     </a>