Fixes #4746: Prevent PowerShell commands from hanging indefinitely

[roomote]

Summary

This PR fixes issue #4746 where RooCode would wait indefinitely for user input after executing PowerShell commands instead of automatically resuming when the command completes.

Root Cause

The issue was caused by PowerShell commands with sleep delays not properly signaling completion to VSCode's shell integration. When the PowerShell counter workaround and command delay features were enabled, the additional commands appended to the original command could cause the shell integration to not properly detect when the command had finished executing.

Changes Made

1. Improved PowerShell command construction: Wrapped commands in try-finally blocks to ensure proper completion handling
2. Added timeout mechanism: Added a timeout for PowerShell commands to prevent indefinite waiting (shell integration timeout + 5 seconds buffer)
3. Fixed variable scoping: Moved PowerShell detection logic before it's used in the timeout mechanism
4. Enhanced error handling: Better handling of PowerShell sleep commands to prevent hanging

Technical Details

• Modified to use try-finally blocks for PowerShell commands with delays
• Added a timeout mechanism that automatically resolves shell execution if VSCode's shell integration doesn't signal completion within the expected timeframe
• Fixed variable scoping issue where was being used before declaration

Testing

• All existing terminal tests pass
• PowerShell-specific tests are properly skipped on systems without PowerShell Core
• No breaking changes to existing functionality

Fixes

Closes #4746

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Important

Fixes indefinite hanging of PowerShell commands in TerminalProcess.ts by adding timeouts and ensuring proper command completion.

• Behavior:
  • Wrap PowerShell commands in try-finally blocks in TerminalProcess.ts to ensure proper completion.
  • Add timeout mechanism for PowerShell commands to prevent indefinite hanging, with a 5-second buffer over shell integration timeout.
• Technical Changes:
  • Modify command construction to include Write-Output for PowerShell counter workaround.
  • Adjust command delay handling by wrapping in try-finally.
• Misc:
  • Fix variable scoping issue by moving PowerShell detection logic before usage in timeout mechanism.

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[daniel-lxs]

Closing this PR for now. The current implementation uses a static timeout, which would cause legitimate long-running commands to fail after only 10 seconds.

It might be a good idea to explore completion flags like on #4564