Post-upgrade verification for the 2.0 libSQL engines: confirms every embedded signal is configured AND running on the libSQL engine, the extension capability handshake holds, legacy stores were converted (with rollback material retained), and data is present.
Run on a live node (e.g. from bin/my_app remote):
TimelessPhoenix.doctor()Prints a report and returns {verdict, report} where verdict is
:ok | :warn | :error. :ok means safe to trust the conversion.