feat: funciones Bash — install_nbconvert, notebook_to_pdf, export_analysis_pdfs

Infra: install_nbconvert (instala nbconvert+deps), notebook_to_pdf (convierte .ipynb a PDF).
Pipeline: export_analysis_pdfs (exporta todos los notebooks de analysis/ a PDF).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

bash/functions/infra/notebook_to_pdf.md

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+---
+name: notebook_to_pdf
+kind: function
+lang: bash
+domain: infra
+version: "1.0.0"
+purity: impure
+signature: "notebook_to_pdf(project_dir: string, [pattern: string], [output_dir: string]) -> string"
+description: "Convierte notebooks Jupyter a PDF usando nbconvert webpdf con chromium. Lista los PDFs generados al finalizar."
+tags: [jupyter, notebook, pdf, export, nbconvert, playwright]
+uses_functions: []
+uses_types: []
+returns: []
+returns_optional: false
+error_type: "error_go_core"
+imports: []
+tested: false
+tests: []
+test_file_path: ""
+file_path: "bash/functions/infra/notebook_to_pdf.sh"
+---
+
+## Ejemplo
+
+```bash
+source notebook_to_pdf.sh
+
+# Con defaults (notebooks/*.ipynb -> notebooks/pdf/)
+notebook_to_pdf /home/lucas/analysis/finanzas
+
+# Con pattern y output_dir custom
+notebook_to_pdf /home/lucas/analysis/finanzas "notebooks/01_*.ipynb" "exports/pdf/"
+```
+
+## Notas
+
+Requiere nbconvert y playwright con chromium instalados (usa `install_nbconvert` antes). Usa el venv del proyecto directamente (`.venv/bin/jupyter`). El output_dir es relativo a project_dir. Imprime los PDFs generados con sus rutas al finalizar. Falla si no se genera ningun PDF.