Fix all remaining mustfix items + Edge policies
00-admin-account: empty password (SecureString), FullName via ADSI SetInfo()
07-backinfo: new script replacing 07-desktop-info - copies assets, sets
registry OSName, creates Startup shortcut, launches BackInfo immediately
Deploy-Windows.ps1: step 7 now calls 07-backinfo.ps1 (desktopInfo->backinfo)
03-system-registry: full Edge policy set - favorites bar, Google search,
show/hide toolbar buttons per spec, telemetry/content policies, removed
old Edge policies TODO note
web/spec: step-00 OK, step-07 OK, step-03 Edge rows updated
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
108a22e7cb