feat: enforce explicit event-time freshness promises

feat: enforce explicit event-time freshness promisesphlohouse/phlo #1197 · 3 diagrams

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01 / 04SLA now supports explicit data timestamp columnsSLA declarations accept an explicit timestamp column and reference time for historical evaluation. updates SLA and serialize_sla in +25 −2 to validate timezone-aware references.
02 / 04Decorator now generates checks for explicit SLAsPandera quality decorators generate and append an executable freshness check when an explicit SLA is attached. calls convert SLA to check in +19 −4.
03 / 04Freshness check now fails on missing timestampsEmpty datasets or unparseable timestamps fail the check when usable timestamps are required. evaluates timestamps in +45 −7.
04 / 04Everything this change touchedThe flow contracts, quality rule helpers, and Pandera freshness check pipeline in one picture.

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