feat(binder): add Project.toml, postBuild, and requirements.txt for Binder setup

Author: amaurigmartins

binder/Project.toml

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+# Minimal Julia environment for Binder (JupyterLab)
+
+[deps]
+IJulia = "7073ff75-c697-5162-941a-fcdaad2a7d2a"
+Interact = "c601a237-2ae4-5e1e-952c-7a85b0c7eef1"
+
+[compat]
+julia = "1.11"
+

binder/postBuild

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+#!/usr/bin/env bash
+set -euxo pipefail
+
+# Ensure classic extensions are enabled for RISE & ipywidgets (Notebook 6.x)
+jupyter-nbextension install rise --py --sys-prefix || true
+jupyter-nbextension enable  rise --py --sys-prefix || true
+jupyter-nbextension enable  widgetsnbextension --py --sys-prefix || true
+
+# Optional: ensure lab classic is available, but RISE is classic-only
+echo "postBuild complete"

binder/requirements.txt

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+# Python packages for Binder (classic Notebook + RISE + widgets)
+# Pin Notebook 6.x because RISE does not support Notebook 7.
+
+notebook==6.5.7
+nbclassic>=1.0.0
+rise==5.7.1
+ipywidgets==8.1.3
+widgetsnbextension==4.0.10
+jupyterlab>=4