Execute JavaScript in an Electron app's renderer process via CDP.

Returns the last expression's value. Use state object to persist data between calls.

Key patterns:

• Click: document.querySelector('#btn').click(); 'done'

• Fill input: el.value='text'; el.dispatchEvent(new Event('input',{bubbles:true}))

• Read DOM: Array.from(document.querySelectorAll('a')).map(a=>({text:a.textContent,href:a.href}))

Best practices:

• Use multiple calls: find element → interact → verify result

• Always return a value to confirm what happened

• Check page state after actions (don't assume)

Error "No Electron targets found" = app needs --inspect flag or CDP_PORT env var mismatch.

Reset CDP connection. Use when execute times out or returns connectivity errors. Clears the state object.