Docs: clarify run --code-export (runtime replay) vs testmd export (portable Playwright)

[tlemmonds]

Summary
run --code-export emits a testmu-runtime-wrapped replay (with vision_query calls) — not portable standalone Playwright. The portable path is testmd export. The naming makes these easy to conflate.

Ask
Document the distinction clearly (and/or rename), so users know which command yields portable Playwright.

[siddhant573]

Hi @tlemmonds , The generated script is standalone and replayable, We have testmu binding as the public package which give support for lot of different functionality support on our platform like autoHeal, vision based waits and etc.