- `sif patchnote` (also `-pn`) fetches the latest github release and renders
its notes with glamour
- on the first run of a new version those notes are shown once, then recorded
so they dont show again - best-effort, so dev builds, the SIF_NO_PATCHNOTES
opt-out, and any network failure stay quiet
- wire up `var version` so the release `-X main.version` ldflag actually lands,
and add `sif version`
vmfunc