Function build_foreign_to_sync_migrate_bundle 

pub fn build_foreign_to_sync_migrate_bundle(
    tool: PrivilegeTool,
    dry_run: bool,
    pkgs: &[String],
) -> Result<(Vec<String>, Vec<String>), String>

What: Build privileged migrate commands: remove foreign packages then install from sync.

Inputs:

• tool: Active privilege backend.
• dry_run: When true, emit echo DRY RUN: ... only.
• pkgs: Package names to remove and reinstall (same pkgname).

Output:

• (summary_lines, commands) for crate::install::ExecutorRequest::Update.

Details:

• Single transaction chain pacman -Rns then pacman -S for all names.
• -Rns may remove dependents; UI must warn users before calling.

Errors

• Returns an error when pkgs is empty or privilege command construction fails.