fix(openapi): declare the route samples a workout detail answers

WorkoutRouteGeometry.sampleTimestamps was declared as an array of strings. Both track ingests (the workout batch and the Apple Health export) store one object per point, { t, speedMs?, hr? }, and the detail answers them as stored. The response is unchanged; the contract now says what it holds.

docs/api/openapi.yaml

@@ -50492,8 +50492,24 @@ components:
           anyOf:
             - type: array
               items:
-                type: string
+                type: object
+                properties:
+                  t:
+                    type: string
+                    format: date-time
+                    pattern: ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d(?:\.\d+)?(?:Z|([+-](?:[01]\d|2[0-3]):[0-5]\d)))$
+                  speedMs:
+                    type: number
+                  hr:
+                    type: integer
+                    minimum: -9007199254740991
+                    maximum: 9007199254740991
+                required:
+                  - t
+                additionalProperties: false
             - type: "null"
+          description: "One entry per geometry point, as the track was ingested: its instant and, where recorded, speed (m/s) and
+            heart rate (bpm)."
       required:
         - geometry
         - sampleTimestamps

src/lib/openapi/routes/workouts.ts

@@ -185,7 +185,18 @@ const workoutListResponse = z
 const workoutRouteGeometry = z
   .object({
     geometry: z.unknown(),
-    sampleTimestamps: z.array(z.string()).nullable(),
+    sampleTimestamps: z
+      .array(
+        z.object({
+          t: isoDateTime(),
+          speedMs: z.number().optional(),
+          hr: z.number().int().optional(),
+        }),
+      )
+      .nullable()
+      .describe(
+        "One entry per geometry point, as the track was ingested: its instant and, where recorded, speed (m/s) and heart rate (bpm).",
+      ),
   })
   .meta({ id: "WorkoutRouteGeometry" });