chore(release): v1.29.0 — a daily health companion

The capstone of the daily-value milestone. On top of the Today view, the daily
loop (coach check-in, morning freshness, daily note) and the documents/coach
work already shipped, this completes the picture:
- ECG woven into the insights narrative (device-attributed only, never the
  app's own reading; a new recording surfaces gently in Today).
- Intraday heart rate as the shape of the day, with a careful elevated-at-rest
  tension note (never during activity, never a verdict).
- Calm milestones — states reached, not streaks to keep.
- The cohesion layer: the chosen health rings return to the Today hero, each
  surface carries its metric's calm colour identity, and a quiet reached-moment
  for a milestone — one design throughout.

No new data collected; every daily surface reads the overnight digest. No
migration in this release.

docs/api/openapi.yaml

@@ -1,7 +1,7 @@
 openapi: 3.1.0
 info:
   title: HealthLog API
-  version: 1.28.56
+  version: 1.29.0
   description: >-
     Self-hosted personal-health-tracking PWA — public API surface for the iOS native client and external ingest.