docs(adopters): add PandaStudio - #1433

Hi! I've rebased this onto main and resolved the table conflict, so it's mergeable now and the diff is a single ADOPTERS.md row. Would love a quick review whenever someone has a moment 🙏. Happy to shorten the blurb if you'd prefer. Thanks for HyperFrames; it powers all the motion-graphics and caption rendering in PandaStudio.

Closing in the backlog value sweep. This is documentation, test-only, dependency upkeep, refactoring, or narrow diagnostic/ergonomic polish without enough current user impact or an active merge path to justify carrying it open. Please reopen or resubmit against current main if the need is still concrete.

Thanks for reopening. To the two points in the sweep message:

• Active merge path: this is already rebased onto current main, mergeable, and a single-line ADOPTERS.md row, so there's nothing to resolve.
• User impact: PandaStudio is a shipping, paid desktop video editor whose entire motion-graphics, caption, and overlay rendering pipeline runs on HyperFrames (@hyperframes/core, @hyperframes/engine, @hyperframes/producer) in production. That makes it a real downstream adopter, which is what this list is for.

Happy to trim the blurb to match the length of the other rows if you'd prefer. Thanks for the library.

Closing now that the refreshed, attributed successor #3663 has merged, with both adopter entries preserved and current usage verified. Thanks for the original contribution.