docs: include Polar and dependency fixes

CHANGELOG.md

@@ -26,6 +26,13 @@
   registrations merge transactionally without crossing account boundaries,
   refresh-token bindings follow the surviving device, and mood edits preserve
   rated factors unless the caller explicitly replaces them.
+- **Polar sync follows the current AccessLink collection API.** Collection
+  requests no longer include the obsolete user ID path segment, and current
+  activity, Nightly Recharge, cardio-load, sleep, and SpO2 response shapes are
+  normalized without losing stable measurement identity.
+- **The July dependency bundle is included.** PDF.js 6 now releases its loading
+  task correctly; Canvas 1.0, Radix UI 1.6.2, Tailwind CSS 4.3.3, the Tailwind
+  Prettier plugin 0.8.1, and setup-node 7 are integrated.
 
 No migrations. No breaking changes.