clippy::useless_vec. Pushed broken because the verification chain used
`if ... then echo` blocks that report status without gating the `&&`
that follows — the same shape of mistake as e1bddf2, where a grep
succeeded on the error text. Both times the check printed FAIL and the
push went ahead.
The reliable form is a single fail-fast chain:
just lint && just test && just determinism && cargo test --doc
so nothing runs after the first failure.