#137 docs: the boundaries doc is the cohort charter's Replicator annex; Archiver produces content.fetch-policy after F1 - #143

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: astral-sh/setup-uv@v5, google-github-actions/auth@v2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/