Nested vhs render inside a recording panics with 'use of closed network connection'

[conorbronsdon]

While recording a demo of vhs itself (a tape whose commands include rendering another tape), the outer render reliably crashes:

panic: write tcp 127.0.0.1:<port>->127.0.0.1:<port>: use of closed network connection

Reproduced twice. It looks like the inner vhs's browser session (go-rod/chromedp) collides with the outer one's connection.

Repro:

1. inner.tape: any minimal tape (Output inner.gif, one Type/Enter).
2. outer.tape: Output outer.gif, then Type "vhs inner.tape", Enter, Sleep 10s.
3. vhs outer.tape → panic above.

Environment: vhs 0.11.0 via winget, Windows 10 (10.0.19045), ttyd via winget, recording shell is WSL Ubuntu 24.04 bash.

Fully understand if nested rendering is out of scope — if so, a graceful error ("vhs is already recording") would beat the panic. Happy to provide the exact tapes or test a patch.