feat(measurements): add ANS_CHARGE and CARDIO_LOAD measurement types

Polar Nightly Recharge and Training Load Pro carry two native signals with
no existing home: the HRV-based autonomic-nervous-system charge (distinct
from the 1-6 recovery band that maps to RECOVERY_SCORE) and the device-native
cardio-load strain figure (distinct from WHOOP DAY_STRAIN and the COMPUTED
STRAIN_SCORE). Add both to the canonical enum (migration 0166) and wire them
through the validation enum, canonical units, plausibility ranges, category
cluster, chart-token allowlist, PR-direction resolver, and the measurement-
list label/icon/colour maps, with labels across all six locales. Both are
device-derived composites, so they read no PR direction and stay out of the
clinical vitals PDF, matching the WHOOP-native score classes.

Regenerate the OpenAPI contract for the two new enum members.

docs/api/openapi.yaml

@@ -1569,6 +1569,8 @@ paths:
               - AVERAGE_HEART_RATE
               - MAX_HEART_RATE
               - SLEEP_DISTURBANCE_COUNT
+              - ANS_CHARGE
+              - CARDIO_LOAD
         - in: query
           name: from
           schema:
@@ -1743,6 +1745,8 @@ paths:
                     - AVERAGE_HEART_RATE
                     - MAX_HEART_RATE
                     - SLEEP_DISTURBANCE_COUNT
+                    - ANS_CHARGE
+                    - CARDIO_LOAD
                 value:
                   type: number
                 measuredAt:
@@ -4372,6 +4376,8 @@ paths:
               - AVERAGE_HEART_RATE
               - MAX_HEART_RATE
               - SLEEP_DISTURBANCE_COUNT
+              - ANS_CHARGE
+              - CARDIO_LOAD
             description: "The measurement type to read (single metric — no fan-out). Closed enum: an unknown type 422s."
           required: true
           description: "The measurement type to read (single metric — no fan-out). Closed enum: an unknown type 422s."
@@ -8831,6 +8837,8 @@ components:
             - AVERAGE_HEART_RATE
             - MAX_HEART_RATE
             - SLEEP_DISTURBANCE_COUNT
+            - ANS_CHARGE
+            - CARDIO_LOAD
         value:
           type: number
         unit:
@@ -9260,6 +9268,8 @@ components:
             - AVERAGE_HEART_RATE
             - MAX_HEART_RATE
             - SLEEP_DISTURBANCE_COUNT
+            - ANS_CHARGE
+            - CARDIO_LOAD
         value:
           type: number
         unit: