Update partition layout to 4MB factory/ota_0/ota_1 partitions for larger
firmware images. Add a 60-second validation timer that starts after the
hello message is sent on boot from an OTA partition. The partition is only
marked valid (via esp_ota_mark_app_valid_cancel_rollback) after receiving
a role message from the mothership. If the timer expires without role
receipt, the partition stays unconfirmed and the bootloader rolls back to
the previous firmware on next reset.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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