## Why
WSL interop can block while launching the Windows terminal probe, stalling TUI startup. Inconclusive detection can also enable keyboard enhancements that break dead-key composition in VS Code on WSL.
## What changed
- Give the Windows `TERM_PROGRAM` probe a one-second deadline, with launch and cleanup handled on a worker thread. Cache the result, including timeouts, and kill and reap probes that outlive the deadline once launch returns.
- Distinguish VS Code, other terminals, and unknown detection results. Disable keyboard enhancements on WSL for VS Code or unknown results, while preserving the `CODEX_TUI_DISABLE_KEYBOARD_ENHANCEMENT` override.
## Testing
Add regression tests for probe output and exit status, failed launches, timeouts during launch and execution, and child cleanup. Extend detection and override tests to cover unknown results.
GitOrigin-RevId: 39e980b0d7cf3d6716ee61597d6002b0fd59651e
Eric Traut
8f9d0e4652