chore(release): v1.28.0 — document intelligence

Marks the document line as one coherent milestone: the vault becomes a
place to understand files, not just store them — read, indexed, searched,
shared, and answered — with a local-first / consented AI posture and a
vendor-blind egress notice held at every step. Ships alongside a full
correctness, resilience, and quality sweep down to the low-priority findings.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "healthlog",
-  "version": "1.27.33",
+  "version": "1.28.0",
   "description": "Self-hosted personal-health-tracking PWA with Withings integration, AI insights, and doctor-report PDF export.",
   "license": "PolyForm-Noncommercial-1.0.0",
   "homepage": "https://healthlog.dev",