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/lib/notifications/dose-tag.ts

@@ -1,18 +1,10 @@
 /**
- * v1.18.4 — stable Web Push notification tag for a medication dose slot.
+ * Stable notification tag for a medication dose slot, `(medicationId,
+ * scheduledFor instant)`. A repeated reminder for the same dose replaces the
+ * one already shown instead of stacking a second.
  *
- * A PWA self-hoster with no Apple Developer account has no Live Activity to
- * end when a dose is logged. Instead the server pushes a `type: "clear"`
- * web-push that the service worker turns into `getNotifications({ tag })` +
- * `notification.close()`. For that to work the REMINDER push and the CLEAR
- * push must agree on a single, stable tag per dose slot.
- *
- * The slot is uniquely identified by `(medicationId, scheduledFor-instant)`:
- *  - the dose-due reminder fires with `scheduledAt` = the slot's ISO instant,
- *  - the clear-on-taken fires with `scheduledFor` = the same ISO instant.
- *
- * `scheduledFor` is normalised through `Date` so a reminder ISO carrying
- * milliseconds and a clear ISO without them still collapse to one tag.
+ * The instant is normalised through `Date`, so an ISO string with and one
+ * without milliseconds give the same tag.
  */
 export function medicationDoseTag(
   medicationId: string,