f96b9953c5
Move disk cleanup out of the Windows Update loop: - PS scripts: extract Invoke-DiskCleanup function, add -CleanupOnly switch for standalone post-update cleanup pass. - Python command: always pass -SkipCleanup:$true during WU loop; after loop exits 0, run a separate -CleanupOnly invocation (skipped if --skip-cleanup). Fails fast if cleanup-only returns nonzero. - Tests: 3 new tests for cleanup-runs-after-loop, skip-cleanup suppresses it, and cleanup-failure propagates as ClickException. - ruff --fix: remove unused shutil import, sort imports, fix UP037/UP035. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>