setup-devvm.sh now needs golang-go (builds t3-dispatch in section 9) and uses unzip
(kubelogin extraction); neither was in the manifest, so a fresh box would skip the
t3-dispatch build. Also add build-essential (cgo / npm native modules) + core tools
that were manually-installed but uncaptured (rsync, wget, tree, shellcheck). Noted
gh as non-apt (GitHub's own repo). All verified to resolve in apt.
[ci skip]
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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