pub static EMPTY_ARTIFACTS: ReleaseArtifactsExpand description
A shared empty artifact set — the value carried through the dry-run / build
phases and by every non-publish caller (EffectCtx::artifacts must always
point at something).
A module-level static (not an associated const) so &EMPTY_ARTIFACTS is a
genuine &'static ReleaseArtifacts that a returning function can hand out; a
const holding a Vec (which has Drop) is inlined at each use site as a
local temporary and cannot escape its enclosing expression.