fix: skip powershell test if pwsh is not installed

[jdx]

Summary

• Adds the same skip pattern used by fish, bash, and zsh tests to the PowerShell test
• Allows the test to gracefully skip when pwsh is not available instead of failing

The other shell tests all have this pattern:

if Command::new("fish").arg("--version").output().is_err() {
    eprintln!("Skipping fish test - fish shell not installed");
    return;
}

This PR adds the equivalent for PowerShell.

Test plan

• Test skips gracefully when pwsh is not installed
• Test runs normally when pwsh is available

🤖 Generated with Claude Code

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Note

Test reliability

• Adds a guard in test_powershell_completion_integration to detect missing pwsh and skip with a message
• Aligns PowerShell test behavior with fish/bash/zsh completion tests; no other changes

^{Written by Cursor Bugbot for commit 7858c49. This will update automatically on new commits. Configure here.}

[Copilot]

Pull request overview

This PR adds a graceful skip mechanism to the PowerShell completion integration test when PowerShell Core (pwsh) is not installed. This aligns the PowerShell test with the existing pattern used by fish, bash, and zsh tests, preventing test failures in environments without PowerShell.

Changes:

• Added pwsh availability check at the beginning of test_powershell_completion_integration()
• Updated comment from "NO skip - CI must have pwsh installed" to "Skip if pwsh is not installed"

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 45.36%. Comparing base (33dda62) to head (7858c49).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #457   +/-   ##
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  Coverage   45.36%   45.36%           
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  Files          47       47           
  Lines        7221     7221           
  Branches     7221     7221           
=======================================
  Hits         3276     3276           
  Misses       1987     1987           
  Partials     1958     1958           

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