watermark-drives-finalization

Status: IN

Windows are never finalized by event processing alone; only `advance_watermark` transitions windows to FINALIZED and emits `AggregationResult`s.

Source: entries/2026/06/05/ad-click-event-aggregation-click_aggregator.md

Depended on by

• dedup-outlives-aggregation-window
• watermark-finalization-is-irreversible

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