PowerShell attempt 1: python .\wheel-scroll.py — python pid 37008, Exit code 1
SPI_GETWHEELSCROLLLINES original 3. SPI_SETWHEELSCROLLLINES error 5. Restore also WinError 5.
PowerShell attempt 2: dangerouslyDisableSandbox — identical SPI_SET WinError 5.
Attempt 3: Start-Process -Verb RunAs — Access is denied before Python launched.
Desktop measurement: host Arena panel stayed white BASE 3 / NOW 3. 149 wheel-probe lines all now=3. Failed API return is not that measurement. Not a Git Bash startup failure.