Go Web Expert System Five non-negotiable rules for production-quality Go web applications. Every handler, every service, every line of code must satisfy all five. Quick Reference | Topic | Reference | |-------|-----------| | Validation tags, custom validators, nested structs, error formatting | references/validation.md | | httptest patterns, middleware testing, integration tests, fixtures | references/testing-handlers.md | Rules of Engagement | # | Rule | One-Liner | |---|------|-----------| | 1 | Zero Global State | All handlers are methods on a struct; no package-level for mutable state | |…