Instructions to minimize regression until next major update

[smblee]

Hello all!

I know there's lots of changes in flight, but it's been quite hard to keep track of multiple threads/convos.

We already have a fairly large app written in SvelteKit, and I want to make sure my team is setting ourselves up for as smooth as transition for the next major update.

In order to minimize regressions,iIt would be nice to have some high level guidance on what to do and what not to do (e.g. dont use session/stuff because they are going away, etc.), and idiomatic ways of doing things (How to share data across SSR + CSR, invalidate specific endpoints, etc.)

If it's too early and the major release is miles away, I would be ok with considering this a bit later down the line, but still would be really nice to get tl;dr of more or less finalized decisions.