Point the commandWait comment at the Dockerfile's test limit (closes #195)

The comment said script/test gives the package 30 seconds. script/test
sets no time limit; the test phase of the Dockerfile sets one with
go test -timeout. The comment now names that place instead of a number.

Model: opus-5-5

internal/cli/integration_test.go

@@ -34,9 +34,10 @@ const (
 	testMnemonic = "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about"
 
 	// commandWait is how long a test lets the secret binary run before it
-	// kills it and fails. It stays well under the 30 seconds script/test
-	// gives the whole package, so a command that hangs fails the test with
-	// the test's own message instead of Go's timeout panic.
+	// kills it and fails. It stays well under the time limit the test phase
+	// of the Dockerfile gives the whole package (go test -timeout), so a
+	// command that hangs fails the test with the test's own message instead
+	// of Go's timeout panic.
 	commandWait = 10 * time.Second
 )