feat(powershell): compact WSL interop output

[lntutor]

Summary

• add rtk powershell / rtk pwsh routing while preserving powershell.exe, pwsh, or powershell
• normalize UTF-8 BOM and CRLF output from Windows interop
• compact standard PowerShell Format-Table and Format-List padding
• pass interactive, help/version, and ConvertTo-Json commands through unchanged
• cap oversized generic output with full-output recovery and preserve failures verbatim

Verification

• cargo test --all-targets --all-features
• cargo clippy --all-targets --all-features -- -D warnings
• cargo fmt --check
• git diff --check
• compiled proxy smoke tests for rewrites, table/BOM output, JSON passthrough, truncation, and exit-9 failure

Closes #2313

[CLAassistant]

All committers have signed the CLA.

[lntutor]

The benchmark failure is unrelated to this change: mockhttp.org/json/1 rotates response payloads, while the benchmark compares two separate requests. I reproduced the same failure mode on develop and opened #3340 to make the curl JSON comparison deterministic with the repository fixture. All other checks on this PR pass.