Mirror src/push/apns.ts behind the same NotifyService seam (combineNotifyServices),
so held-gate/done hook events fan out to Android via data-only high-priority FCM with
zero new event paths. OAuth2 bearer via google-auth-library (R7); payload minimized to
sessionId/cls/token (never cwd/command/bytes); intentionally-loose FCM-token validator;
Origin-guarded + rate-limited POST/DELETE /push/fcm-token; FCM_* env all-or-disabled.
Cross-review fix: dropped validateStatus:()=>true so google-auth-library's built-in
401 refresh-and-retry actually fires. 60 new tests; full server suite green; tsc clean.
