Background grounding and recipe fix-up API (#90)

Co-authored-by: dev_agent <dev_agent@cubecraftlabs.com>

internal/dinners/export_test.go

@@ -0,0 +1,14 @@
+package dinners
+
+import (
+	"testing"
+	"time"
+)
+
+// SetGroundTimeout sets the deadline of grounding by hand until t ends. A
+// test calling it must not run in parallel.
+func SetGroundTimeout(t *testing.T, d time.Duration) {
+	old := groundTimeout
+	groundTimeout = d
+	t.Cleanup(func() { groundTimeout = old })
+}