alarms, timers, world_clocks and stopwatch_laps, with the schema exported
to app/schemas and committed so migrations can be tested from v1 onwards.
The DAOs return Flows for reads and keep every multi-step write inside a
@Transaction, so a read-modify-write cannot lose a concurrent one.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
