Accept pwsh for shell completions

[GreyforgeLabs]

Summary

• Accept pwsh as a shell-completion alias for PowerShell.
• Keep existing shell names intact with a small parser for completion shell arguments.
• Add CLI regression coverage that completion pwsh --install reaches the PowerShell completion path.

Fixes PlatformNetwork/bounty-challenge#49285.

Validation

• cargo test -p cortex-cli --test completion_pwsh --no-default-features --features cortex-tui -- --nocapture
• cargo check -p cortex-cli --no-default-features --features cortex-tui
• cargo fmt --package cortex-cli --check
• git diff --check
• git diff --cached --check

Note

Direct completion generation in the debug test binary currently trips an unrelated existing clap debug assertion for a duplicated mcp ls alias, so the regression covers the parser and PowerShell install path without invoking the generator.

[greptile-apps]

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