Function moveLockedExeAside

src/upgrade/remove-binary.ts:249–261

* Rename the running (locked) node.exe out of `dir` so the rest of the tree * deletes cleanly — Windows allows renaming a mapped image, just not deleting * it. Returns the leftover path, or null when nothing needed moving.

(dir: string, deps: RemoveBinaryDeps)

 * it. Returns the leftover path, or null when nothing needed moving.
 */
function moveLockedExeAside(dir: string, deps: RemoveBinaryDeps): string | null {
  if (deps.platform !== 'win32') return null;
  const P = pathFor(deps.platform);
  const resolvedDir = P.resolve(dir) + P.sep;
  if (!P.resolve(deps.execPath).startsWith(resolvedDir)) return null;
  const leftover = P.join(P.dirname(P.resolve(dir)), `codegraph-old-node-${process.pid}.exe`);
  try {
    deps.rename(deps.execPath, leftover);
    return leftover;
  } catch {
    return null; // rename failed too — the rm error will surface the dir
  }
}

export function executeBinaryRemoval(
  plan: BinaryRemovalPlan,