Pass through `cwd` from ACP extension (#39511)

If we get a `cwd` from ACP (because e.g. `codex-acp` is driving the
terminal rather than our own PTY) then use that to display the `cwd` of
the terminal process.

Release Notes:

- N/A
21e75b8221Richard Feldman committed on 10/4/2025, 4:50:14 AM· committed by GitHubparent978951b
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