Test go generate as part of mechanical checks

-- go.mod --
module sketch.dev

go 1.23

-- .commit --
Initial commit

-- gen.go --
//go:build ignore

package main

import (
	"os"
)

func main() {
	f, _ := os.Create("generated.go")
	defer f.Close()
	f.WriteString("// Code generated by go generate; DO NOT EDIT.\n")
	f.WriteString("package main\n")
	f.WriteString("const GeneratedValue = 42\n")
}

-- main.go --
package main

//go:generate go run gen.go

func main() {
	println("Hello, world!")
}

-- .commit --
Initial commit with go generate directive

-- .run_test --
# Info

The following files were changed by running `go generate`:

/PATH/TO/REPO/generated.go

Please amend your latest git commit with these changes.