chore: correct comments that describe the removed clear push and API cache

The dose tag comment still explained the clear push sent for a logged
dose, the session-end wipe comment still named the worker's API cache as
a live layer, and the worker's header and foreign-origin note did not
match what the worker stores and when it resumes.

src/__tests__/baselines/version-stamp-comments.json

@@ -1,7 +1,7 @@
 {
   "$comment": "Comment lines that open with a release version, per file under src/. Maintained by src/__tests__/version-stamp-ratchet.test.ts.",
-  "count": 2876,
-  "total": 9163,
+  "count": 2875,
+  "total": 9162,
   "entries": {
     "__tests__/account-payload-consumer-guard.test.ts": 2,
     "__tests__/acting-account-boundary-guard.test.ts": 7,
@@ -2581,7 +2581,6 @@
     "lib/notifications/delegated-intake.ts": 2,
     "lib/notifications/dispatch-localised.ts": 3,
     "lib/notifications/dispatcher.ts": 3,
-    "lib/notifications/dose-tag.ts": 1,
     "lib/notifications/medication-intake-sync.ts": 1,
     "lib/notifications/senders/__tests__/apns.test.ts": 7,
     "lib/notifications/senders/__tests__/push-attempt-record.test.ts": 1,