Two-terminal dev loop (go run + vite proxy), the full check matrix,
and the regenerate-types rule: web/src/types/ is generated from the
Go structs and must never be edited by hand.
go.mod declares the module path (github.com/JustinZeus/spreadlab); every
import inside the repo is spelled relative to it. Layout follows the
standard Go shape: cmd/<binary>/main.go per executable, internal/ for
packages other modules may not import (the compiler enforces this).
No engine code yet, just a placeholder main that proves 'go build' works.
