Function isWindowsDriveMount

src/sync/watch-policy.ts:56–58

* True for WSL Windows-drive mounts like `/mnt/c` or `/mnt/d/project`. * Deliberately matches only single-letter drive mounts, so genuinely fast * Linux mounts such as `/mnt/wsl/...` are not flagged.

(projectRoot: string)

 * Linux mounts such as `/mnt/wsl/...` are not flagged.
 */
function isWindowsDriveMount(projectRoot: string): boolean {
  return /^\/mnt\/[a-z](\/|$)/i.test(normalizePath(projectRoot));
}

/**
 * Inputs that can be overridden in tests so the decision is deterministic