Replace Bun.spawnSync + realpath with fs.realpathSync to improve index file performance on 14k documents.

[heyglassy]

Big fan of your work Tobi, this is very cool!

Issue / Reproduction

QMD is installed globally on a M1 MacBook Pro, with Ghostty.

Running qmd add on a folder with a 14k file subdirectory hangs the qmd process. I isolated this down to the Bun.spawnSync(["realpath", path]); call on line 119.

Running realpath in the same dir with the small bash script below works. Running Bun.spawnSync with realpath does not.

#!/bin/bash
for file in *; do
  realpath "$file"
done

I also tried Bun.spawnSync with the stat command and that worked correctly.

This commit just changes line 119 to a Bun native fs.realpathSync.

Before commit

After commit