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Marc-André Bombeck
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iOS and watchOS 27 add `HKQuantityTypeIdentifierHeartRateVariabilityRMSSD` (Apple's symbol `c:@HKQuantityTypeIdentifierHeartRateVariabilityRMSSD`, available from 27.0). The live batch and the export.zip import now store it as `HRV_RMSSD`, the type WHOOP, Oura and Polar already write, in milliseconds, mean-aggregated and flagged privacy-sensitive like SDNN. The accepted range is 1 to 300 ms. RMSSD ranks on its own `hrvRmssd` ladder in the SQL source collapse, so a day holding it from Apple Health and a strap resolves to one source instead of a name tiebreak. SDNN and RMSSD are different statistics and are kept apart once one account holds both. The HRV page charts each on its own, titled with its measure, instead of hiding RMSSD behind SDNN. The Coach's HRV section carries one timeline per measure under `byMeasure` (same section key, so every reader still finds it) rather than one daily series averaging the two; the budget pass condenses and sheds each measure's timeline like a glucose context.