v6.0.1 -- Bootstrap Hardening Fixes four defects that shared one signature: a fallback path that could never run, hidden behind a reassuring message. - Successful git clones were reported as failures. `2>&1 | Out-Null` under $ErrorActionPreference = "Stop" turned git's progress output into a terminating error, so every Windows install fell through to the ZIP mirror and therefore to Expand-Archive -- the original bug report. On Linux the same class of bug wore the opposite face: `set -e` plus a bare `git clone` aborted comfyui.sh outright, making all three fallback sources dead code. - `::` comments inside a cmd `( )` block are executed, not ignored. Seventeen of them printed eight "cannot find the drive specified" lines on every install and swallowed a real command. The uv logic moved to a subroutine. - Install.bat printed "[INFO] uv installed." whether or not uv.exe existed. Extraction now cascades System32\tar.exe -> .NET ZipFile -> Expand-Archive and every tier is verified against the file on disk. - SageAttention 2.2.0 had not installed on Windows since v5.1.17: resolve() never tried the platform-prefixed abi3 keys the JSON actually ships, so users silently got sageattention 1.0.6 from PyPI while running launchers that pass --use-sage-attention. Also removes Migrate-from-PS.ps1 and the sync-oneliner job: a duplicate kept aligned by CI that could never push, and had silently drifted in both directions.