Atera agent: download URL requires MFA in browser session, so
Invoke-WebRequest gets HTML instead of MSI. Changed to bundled
MSI from assets/Atera/ - download once from dashboard, no network
dependency. Graceful skip with log message when MSI not present.
Removed unused --resume argument from X9-Resume scheduled task
registration. Resume is detected via state file, not CLI flag.
CI pipeline: added mingw-w64-gcc and CGO_ENABLED=1 for Walk
cross-compilation (required since Walk migration from Fyne).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
