## Why
WSLg clipboard initialization can block indefinitely, and PowerShell clipboard writes can stall while receiving input or exiting. These stalls can prevent subsequent TUI copy requests from completing.
## What changed
- Try the Windows clipboard first for `/copy` and `Ctrl+O` on WSL, falling back to the native clipboard and terminal delivery when needed.
- Give Windows executable discovery and writing a shared five-second deadline, with a separate one-second deadline for native clipboard setup. Reuse pending setup tasks after timeouts to avoid accumulating blocked threads.
- Launch PowerShell through a native shell and stop its process group on write failures or timeouts. Reap the writer before returning so an older copy cannot overwrite a newer one, and suppress stderr that could expose clipboard contents.
## Testing
Add tests for command compatibility, large Unicode input, expired requests, and cleanup of stalled writers and subprocesses. Update routing tests to cover Windows-first copying and native fallback with HTML and clipboard leases.
GitOrigin-RevId: 218c8541a169a16536db0370455e076a31a42b1f
Eric Traut
0c329ad2c9