parseRecurrence required a space ("every day"), so "everyday" (one word) was
missed. Now \bevery\s*day\b matches both, plus "each day". Added Every Weekday
detection ("every weekday", "weekdays") ahead of the broader weekly/daily
patterns. Sub-day cadence ("every hour"/"hourly") is intentionally NOT matched —
the occurrence engine is day-granular, so it stays a one-off rather than being
mislabeled. 6 parser tests added.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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