test(healthkit): cover device-event ingest + the awareness surface

Add mapping tests for the five event classes (verdict resolution,
severity grading, the value-pinned-to-1 contract, unknown-codepoint
fallback, and that a continuous measurement never gets a classification),
the awareness-card gating + device-verdict framing + disclaimer presence,
and the events route narrowing + empty-state contract. Extend the enum,
chart-token and Coach-gate drift guards for the new event types.

src/app/api/insights/__tests__/coach-route-gate-inventory.test.ts

@@ -53,6 +53,11 @@ const NON_COACH_GATED_ROUTES: ReadonlyArray<string> = [
   // `coach`: a user with assessments enabled but Coach disabled can warm.
   "src/app/api/insights/pregenerate/route.ts",
   "src/app/api/insights/pulse-status/route.ts",
+  // v1.10.0 — device-flagged event awareness timeline (categorical
+  // events, WX-B). Pure DB read of the device's own verdicts; gates on
+  // the same `insightStatus` sub-flag as the assessment routes (no Coach
+  // prose).
+  "src/app/api/insights/rhythm-events/route.ts",
   "src/app/api/insights/weight-status/route.ts",
 ];