release packaging: everything before v0.0.1-12 is a mix of tarballs and bare binaries

open   by a73x

v0.0.1-4 through -10 published one `mux-vX-x86_64-linux-musl.tar.gz`.
v0.0.1-11 published four bare binaries, with no decision recorded anywhere
and nothing in the repo consuming either shape.

Bare files cost the exec bit: they download 0644, so `mux HOST` against a
freshly installed box dies with `Permission denied` from the remote muxd and
surfaces as `no endpoint announce (UnterminatedLine)`, naming neither the
file nor the mode. Hit for real on 2026-08-21.

`make release` now settles the convention (static musl, ReleaseSafe,
stripped, tarred, version-checked). v0.0.1-11 is still four bare files on
the server, so anyone installing the current released version walks into it.
Either republish -11 as a tarball or delete its bare files.