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v0.8.57: Add sequential date key styles for datetime PKs
Datetime key columns (relationship 'one' side or PK) now generate unique sequential dates, fixing 'duplicate value not allowed' refresh errors.
- New key_style values: sequential_date, sequential_month_end, sequential_month_start.
- Names like MonthEndDate / EOMDate / LastDayOfMonth detected as monthly-granularity keys (one row per month).
- Newest date anchored at start of current year (daily) or most recently completed month (monthly), walking back.