chore(release): v1.4.38.7

Rollup recompute observability + admin trigger.

- POST /api/admin/rollups/recompute synchronously folds one user or
  re-runs the boot-discovery loop on demand. Admin-gated.
- slim_summaries live-fallback now annotates `fallback_reason` and
  `missing_types[]` so the operator can map a slow cold-mount to
  the type missing DAY-bucket coverage without DB shell access.
- Boot-backfill discovery now logs every result, including the
  silent "no users to backfill" case — the previous shape made it
  impossible to tell "discovery ran cleanly + found nothing" apart
  from "discovery never executed".

See CHANGELOG.md.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "healthlog",
-  "version": "1.4.38.6",
+  "version": "1.4.38.7",
   "description": "Self-hosted personal-health-tracking PWA with Withings integration, AI insights, and doctor-report PDF export.",
   "license": "AGPL-3.0-only",
   "homepage": "https://healthlog.dev",