split filters crate history and rewrites workspace-relative paths for a standalone repository. sync maps later commits in either direction and uses a three-way merge for concurrent edits.
cargo rail split init my-crate
cargo rail split run my-crate --check
cargo rail split run my-crate
cargo rail sync my-crate --to-remotesync --from-remote creates a review branch in the monorepo. Manual conflicts leave files and a receipt for cargo rail sync --resume <receipt>.