Effect v3 to v4 Migration Drive an Effect v3 → v4 migration from the generated migration reference that ships in the Effect repo. Every rename, removal, and signature change is answered by upstream data — do not guess replacements. Workflow Work through these steps in order; each one is detailed in the section named. 1. Set up and validate the local checkouts — two shallow clones; verify any pre-existing before trusting it. See Setup: Local Checkouts . 2. Read and for the background and guide index. See Reading Order . 3. Migrate — remove consolidated packages, align every remaining Effect pa…