embarrassing, but ill put my solution here in case someone else has a face-palming moment.
the problem was as simple as the error made is sound, i must have deleted page-header.blade.php in /partials
this wasn’t a problem on my local machine, because i wasn’t calling that partial on the views i was developing, but when you upload your site, it defaulted to index.blade.php which had @include('partials.page-header')