`bun not found` after `npm install`

[doctorcolossus]

The README.md says that I can install with bun or npm, but after installing with npm, qmd fails to run, complaining that bun is not found:

$ podman run -it --rm docker.io/nikolaik/python-nodejs:python3.11-nodejs20 /bin/bash

root@2026796445fe:/# npm install -g @tobilu/qmd

added 214 packages in 33s

73 packages are looking for funding
  run `npm fund` for details
npm notice
npm notice New major version of npm available! 10.8.2 -> 11.16.0
npm notice Changelog: https://github.com/npm/cli/releases/tag/v11.16.0
npm notice To update run: npm install -g npm@11.16.0
npm notice

root@2026796445fe:/# qmd
Error: bun not found. Install from https://bun.sh

Why should bun be needed after installing with npm? 🧐