chore(release): v1.4.30

Server-side prep for the next iOS TestFlight build. Five surfaces land together so the iOS engineer can pick them up in one cut-over: a locked externalId shape for daily-aggregated cumulative HealthKit rows, the SyncMode foundation columns + handshake + bulk-backfill endpoints, a first-class MoodEntry.note column that replaces the legacy tag-based workaround, a cross-source workout dedup helper, and two new MeasurementType enums plus the shared category overlay that drives the iOS permission picker and the future Insights nav.

docs/api/openapi.yaml

@@ -899,6 +899,8 @@ components:
             - AUDIO_EXPOSURE_ENV
             - AUDIO_EXPOSURE_HEADPHONE
             - TIME_IN_DAYLIGHT
+            - WALKING_STEADINESS
+            - AUDIO_EXPOSURE_EVENT
           type: string
         unit:
           type: string
@@ -2179,6 +2181,8 @@ paths:
               - AUDIO_EXPOSURE_ENV
               - AUDIO_EXPOSURE_HEADPHONE
               - TIME_IN_DAYLIGHT
+              - WALKING_STEADINESS
+              - AUDIO_EXPOSURE_EVENT
             type: string
         - in: query
           name: from
@@ -2311,6 +2315,8 @@ paths:
                     - AUDIO_EXPOSURE_ENV
                     - AUDIO_EXPOSURE_HEADPHONE
                     - TIME_IN_DAYLIGHT
+                    - WALKING_STEADINESS
+                    - AUDIO_EXPOSURE_EVENT
                   type: string
                 value:
                   type: number