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* docs: document installing specify-cli from a custom package index Add a generic section to the PyPI install guide covering how to point uv, pipx, and pip at a non-default package index (env var and flags), with a placeholder URL, plus notes on pins/upgrades and authentication. Link to it from the main installation guide. Assisted-by: GitHub Copilot (model: Claude Opus 4.8, autonomous) Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: d6ef3f75-54e9-4789-902b-4f0adeaadfad * Potential fix for pull request finding Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> Copilot-Session: d6ef3f75-54e9-4789-902b-4f0adeaadfad