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* fix(extensions): apply GHES auth and resolve release assets for --from The 'specify extension add --from <url>' path fetched ZIPs via a bare open_url with no GitHub release-asset resolution and no Accept header, diverging from the catalog download path. Against GHES it received an HTML login page and failed obscurely with zipfile.BadZipFile. Route --from through ExtensionCatalog so configured GHES credentials apply and release-download URLs resolve via /api/v3, and reject non-ZIP content with a clear error pointing at auth.json. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * fix(extensions): use zipfile.is_zipfile for --from content guard Replace the weak zip_data.startswith(b"PK") prefix check with zipfile.is_zipfile() on a BytesIO so any non-ZIP payload (not just those lacking the PK magic) is rejected with the friendly error before install_from_zip can raise BadZipFile. Addresses PR review feedback. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>