Function run_with_worktree_copy 

pub fn run_with_worktree_copy(
    invocation: &Invocation,
    run_git: &mut GitRunner<'_>,
    identity_after_lock: &mut dyn FnMut() -> Result<WorktreeIdentity, WorktreeCopyError>,
    stderr: &mut dyn Write,
) -> Result<Settlement, WorktreeCopyError>

What: Settles one forwarded invocation: bypasses forward untouched; applicable creating commands run under the settlement lock; other commands only recover pending journals, and only when one exists. Why: The integrator calls this once per forwarded command and turns the settlement into the exit status with exit_code.

In TS you’d write (pseudocode):

await runGitWithWorktreeCopy({ args, gitPath, identity, command, environment });