Add vendor

Specifically because I want to modify a dependency

vendor/github.com/charmbracelet/x/ansi/ansi.go

@@ -0,0 +1,11 @@
+package ansi
+
+import "io"
+
+// Execute is a function that "execute" the given escape sequence by writing it
+// to the provided output writter.
+//
+// This is a syntactic sugar over [io.WriteString].
+func Execute(w io.Writer, s string) (int, error) {
+	return io.WriteString(w, s)
+}