pip is unusual among the custom packages because it ships inside CPython
itself, so it doesn't need a URL or archive. The handler bootstraps it
from the standard-library wheel via 'python3 -m ensurepip --upgrade' and
then self-upgrades to the latest version. Detection uses
'python3 -m pip --version' instead of a filesystem path.
- Move SYSTEM_PACKAGES, FLATPAK_PACKAGES, and CUSTOM_PACKAGES into
formatted_packages.py as typed Python data; drop the bespoke parser
- Custom package URLs are now string templates with {version}, {arch},
and {arch_go} substitutions, so the same entry works on x86_64 and
aarch64 without hand-editing the URL
- Add best-effort latest-version resolvers for Go, Firecracker, and Zig
(using go.dev JSON, GitHub releases, and ziglang index.json
respectively); on any failure the pinned version + sha256 are used
and the fallback is logged
- Make Neovim's archive name and install dir arch-aware (x86_64/arm64)
- Document that --no-gui skips the entire Flatpak section, including
installing flatpak itself