errors.Join vs Multi-Return: When to Aggregate, When to Wrap

Book: The Complete Guide to Go Programming Also by me: Thinking in Go (2-book series) — Complete Guide to Go Programming + Hexagonal Architecture in Go My project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding tools Me: xgabriel.com | GitHub You write a validation function. Five rules. Email format, password length, age range, country code, terms accepted. The user fixes the email, hits submit, gets back "password too short." Fixes that, hits submit, g