Add 24h migration window for legacy/unprovisioned nodes to connect while
flagged as Unpaired rather than silently rejected. Surface unpaired nodes
in the fleet UI with amber badge, pulsing status indicator, and migration
window countdown banner. Add re-provision wizard entry point from fleet
panel — clicking "Pair" on an unpaired node opens the onboarding wizard
in re-provisioning mode, skipping firmware flash and going straight to
serial credential provisioning. After migration window closes, nodes
without valid tokens are rejected outright.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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