feat(update): detect more install methods for the upgrade nudge

Kai Armstrongrequested to merge
phikai/expand-install-method-detection into main

Expand DetectInstallMethod so the "new version available" banner prints a working upgrade command for eight additional install methods: mise, asdf, Snap, Nix, MacPorts, Chocolatey, scoop, and WinGet.

Why

Previously only Homebrew and go install were detected — every other install method fell into the unknown branch, which drops the Run: line from the banner and leaves users to figure out the upgrade path themselves.

The concrete case that motivated this: a comment on #8490 surfaces a Slack thread where a user on mise (~/.local/share/mise/shims/glab) sees no upgrade guidance. This MR fixes that case plus seven others already documented in docs/installation_options.md.

Scope

  • Pure path inspection against the resolved executable path — no shellouts, no OS-specific branches.
  • Windows-specific managers (Chocolatey, scoop, WinGet) match case-insensitively; the rest are case-sensitive.
  • Snap match handles both /snap/glab/... and /var/lib/snapd/snap/glab/... (the mount path used on Fedora/openSUSE where /snap isn't directly mounted).

Deliberately out of scope

  • Detection of apt/dpkg, rpm/dnf, pacman, apk, and Spack: all land at /usr/bin/glab and can't be disambiguated by path alone. Would require shelling out to the package manager or reading /etc/os-release and guessing — separate discussion on #8490.
  • The full self-update capability from the original issue (auto-download, atomic replace, mirror config). Separate comment on #8490 covers scope/lift.

Testing

  • Extended install_method_test.go with a positive case per new detector; preserved the existing negative case that guards against substring-collisions on Homebrew.
  • go test ./internal/commands/update/... — green.

Related to #8490.

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