Jack Hsu 11691d141a
docs(core): add NX_TUI environment variables documentation (#31619)
This PR added two TUI environment variables to the reference page:
- NX_TUI to enabled/disable
- NX_TUI_AUTO_EXIT to control auto-exit behavior

## Current Behavior

The environment variables documentation does not include the new
Terminal UI (TUI) environment variables `NX_TUI` and `NX_TUI_AUTO_EXIT`
that were recently added to control the interactive terminal interface
for task
execution.

## Expected Behavior

The documentation now includes comprehensive information about the TUI
environment variables:
- `NX_TUI`: Controls whether the Terminal UI is enabled or disabled for
running tasks
- `NX_TUI_AUTO_EXIT`: Controls the auto-exit behavior of the TUI after
tasks complete, supporting boolean values or a number for countdown
seconds

## Related Issue(s)

Fixes #31111
2025-06-17 13:27:37 -04:00
..