Default ReImSign impl for an integer-basis ring: route through
re_sign_basis / im_sign_basis against the per-ring RE_DECOMP /
IM_DECOMP tables and the supplied real_sign_fn.
Exact source commit this build was compiled from, captured by
build.rs via git rev-parse HEAD. A -dirty suffix means the
working tree had uncommitted changes at build time (so the bare
commit does NOT fully describe the binary); "unknown" means it was
built outside a git checkout. Recorded in dataset RO-Crate metadata
and surfaced by each CLI’s --version.
Long version string for CLI --version: the crate semver plus the
exact build commit, e.g. 0.1.0 (dd4fd14...) or, for a non-pristine
build, 0.1.0 (dd4fd14...-dirty). Lets a human or a reproduction
script confirm precisely which binary produced a result.