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/pipelines/export_analysis_pdfs.md

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+---
+name: export_analysis_pdfs
+kind: pipeline
+lang: bash
+domain: pipelines
+version: "1.0.0"
+purity: impure
+signature: "export_analysis_pdfs(nombre: string, [pattern: string]) -> void"
+description: "Exporta todos los notebooks de un analisis Jupyter a PDF. Instala nbconvert y playwright automaticamente si no estan presentes."
+tags: [pipeline, jupyter, pdf, export, nbconvert, launcher]
+uses_functions:
+  - assert_command_exists_bash_shell
+  - install_nbconvert_bash_infra
+  - notebook_to_pdf_bash_infra
+uses_types: []
+returns: []
+returns_optional: false
+error_type: "error_go_core"
+imports: []
+tested: false
+tests: []
+test_file_path: ""
+file_path: "bash/functions/pipelines/export_analysis_pdfs.sh"
+---
+
+## Ejemplo
+
+```bash
+# Exportar todos los notebooks de un analisis
+./export_analysis_pdfs.sh finanzas
+
+# Con pattern especifico
+./export_analysis_pdfs.sh ml "notebooks/01_*.ipynb"
+
+# Via fn run
+fn run export_analysis_pdfs finanzas
+fn run export_analysis_pdfs ml "notebooks/01_*.ipynb"
+```
+
+## Flujo
+
+1. `assert_command_exists uv` — verifica que uv esta disponible
+2. `install_nbconvert` — instala nbconvert y playwright con chromium (idempotente)
+3. `notebook_to_pdf` — convierte notebooks al patron indicado a PDF en `notebooks/pdf/`
+
+## Notas
+
+El analysis debe existir previamente en `analysis/{nombre}/` con un venv inicializado. Los PDFs se generan en `analysis/{nombre}/notebooks/pdf/` por defecto. El pipeline usa `set -euo pipefail` — cualquier fallo detiene la ejecucion.