Introduce src/domain/schedule.go with a Schedule value object that
centralizes schedule parsing and validation: Parse, Validate, and
Next(time.Time). It owns the cron parser and @every handling, moved out
of the scheduler. The scheduler's nextRunTime is kept as a thin wrapper
delegating to domain.Parse for now (T2.2 will parse once on load/edit).
Add unit tests covering invalid specs, @every intervals, five-field cron,
cron descriptors, whitespace trimming, the zero-value Next, and String.
Mark T2.1 complete in REFACTORING.md.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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