Function lookupStageStatistics

lookupStageStatistics(
    model: LifecycleStatisticsModel,
    procedureType: string,
    stage: string,
): StageDwellStatistics | undefined
Lookup statistics for a (procedureType, stage) pair.

Performs an exact lookup by lifecycleKey(procedureType, normalizedStage). Returns undefined when no matching cell exists or the cell has zero samples, so callers must handle the missing-data case explicitly.
Parameters
- model: LifecycleStatisticsModel
  The lifecycle statistics model
- procedureType: string
  The procedure type (e.g. COD)
- stage: string
  Normalized stage key
Returns StageDwellStatistics | undefined
Stage statistics, or undefined when no usable data exists
- Defined in utils/lifecycleStatistics.ts:353