This plugin vendors two small image codecs so optional PNG-to-JPEG conversion
works in portable installations without a separate npm install step.

- pngjs 7.0.0: MIT License. See `pngjs/LICENSE`.
- jpeg-js 0.4.4: BSD 3-Clause License. See `jpeg-js/LICENSE`.

Sources were packed from their published npm releases without running package
scripts. Their runtime code is kept under the original license terms.