Merge the untagged glucose bucket across every consumer (#943)

docs/api/openapi.yaml

@@ -49997,9 +49997,9 @@ components:
               additionalProperties:
                 $ref: "#/components/schemas/MetricDataSummary"
             - type: "null"
-          description: Per-context glucose summaries (FASTING / POSTPRANDIAL / RANDOM / BEDTIME) over the trailing 30 days,
-            canonical mg/dL. Contexts with no readings are omitted; the whole block is null when the glucose module is
-            off.
+          description: Per-context glucose summaries (FASTING / POSTPRANDIAL / RANDOM / BEDTIME, plus UNSPECIFIED for readings
+            whose source recorded no meal-time context) over the trailing 30 days, canonical mg/dL. Buckets with no
+            readings are omitted; the whole block is null when the glucose module is off.
         glucoseClinical:
           anyOf:
             - $ref: "#/components/schemas/GlucoseClinicalMetrics"