release-type: rust at path . is incompatible with this virtual
workspace root. release-please's Rust strategy unconditionally appends a
CargoToml update for the root Cargo.toml, and that updater throws
"is not a package manifest (might be a cargo workspace)" whenever the
manifest has no [package] section — so every run died on the final step.
Switch to release-type: simple (touches only a version file + CHANGELOG,
never a manifest) and bump each crate version through the generic updater
via extra-files plus an inline x-release-please-version annotation.
Preserves the single vX.Y.Z tag, all action outputs, and the entire
downstream release.yml unchanged.
Kevin Codex