chore: migrate to Effect v4-beta

[lloydrichards]

Goals/Scope

• Migrate packages, servers, and client to effect v4-beta
• Bump effect language service
• Update documentation for effect v4-beta

Description

This PR updates the codebase to use effect v4-beta across all components (packages, servers, client), upgrades the effect language service, and refreshes the documentation accordingly.

Comment

This PR is for those wanting to quickly migrate to Effect v4-beta when using the template. Just make sure to copy the branches and you can rebase/squash this into the new repo to get started.

git fetch origin
new_commit=$(printf "Initial commit\n" | git commit-tree "$(git rev-parse origin/chore/v4-migrate^{tree})")
git branch -f main "$new_commit"
git push origin "$new_commit":refs/heads/main --force
git push origin :refs/heads/chore/v4-migrate
git fetch origin --prune