Problem

initExternalFormatter() creates a new Tinypool instance each time it is called. In --lsp mode the process stays alive indefinitely, and the Rust side calls initExternalFormatter() again on config reload or project switch. The old pool and its child_process workers are never destroyed, so they accumulate.

Observed in production: 1,500+ orphaned node tinypool/.../process.js processes, 30+ GB RAM after several hours of normal LSP usage.

Fix

Add the same guard that disposeExternalFormatter() already applies on CLI exit — if a pool exists, destroy it before constructing the new one:

export async function initExternalFormatter(numThreads: number): Promise<void> {
  if (pool !== null) {
    await pool.destroy();
    pool = null;
  }
  pool = new Tinypool({ ... });
}

Fixes #24147