The QR code text was built once at script startup. If the device wasn't
AAD-joined yet, it showed "Device not yet Azure AD joined" forever -
even after Phase 1 checks passed. Now regenerates Build-QRCodeText
when Phase1.AzureAdJoined transitions to true.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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