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/install_nbconvert.sh

@@ -0,0 +1,32 @@
+# install_nbconvert
+# ------------------
+# Instala nbconvert y playwright con chromium en un proyecto uv existente.
+# Idempotente: uv add no reinstala si los paquetes ya estan presentes.
+#
+# USO (sourced):
+#   source install_nbconvert.sh
+#   install_nbconvert /path/to/project
+
+install_nbconvert() {
+    local project_dir="$1"
+
+    if [ -z "$project_dir" ]; then
+        echo "install_nbconvert: se requiere project_dir" >&2
+        return 1
+    fi
+
+    if [ ! -d "$project_dir/.venv" ]; then
+        echo "install_nbconvert: no existe .venv en $project_dir — ejecuta init_uv_venv primero" >&2
+        return 1
+    fi
+
+    # Instalar nbconvert y playwright via uv add
+    (cd "$project_dir" && uv add nbconvert playwright 2>&1)
+
+    # Instalar chromium — capturar output, solo mostrar si hay error
+    local playwright_output
+    if ! playwright_output=$(cd "$project_dir" && uv run playwright install chromium 2>&1); then
+        echo "$playwright_output" >&2
+        return 1
+    fi
+}