chore(release): v1.15.0 — cycle tracking

Cut v1.15.0: the private menstrual-cycle vertical. Quick-entry day-log
(period/flow, BBT, mucus, OPK + pregnancy/progesterone tests,
contraception, intercourse, graded symptoms), a calendar + signature
cycle wheel, honest range predictions with confidence + a read-your-body
mode, a BBT chart, phase×vitals + symptom-by-phase insights, opt-in
per-channel reminders, encryption of intent fields, discreet
notifications, a one-tap data purge, and Apple-Health reproductive import
+ health-record export. Predictions run on a deterministic engine the iOS
client mirrors offline.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/api/openapi.yaml

@@ -1,7 +1,7 @@
 openapi: 3.1.0
 info:
   title: HealthLog API
-  version: 1.14.0
+  version: 1.15.0
   description: >-
     Self-hosted personal-health-tracking PWA — public API surface for the iOS native client and external ingest.