Adds the notifications.remote-push.v1 capability, the registerPush and
unregisterPush RPCs on the mobile allowlist, a gateway client with a cached
session and 401 re-auth, a durable unregister outbox, and a dispatcher that
offers every mobile notification to the gateway after the socket fan-out.
The dispatcher is fire-and-forget with one retry and drops registrations the
gateway reports dead.
Puts agentState on the mobile frame and fixes the #4375 wording so a working
agent is never announced as finished. The relay host-proof code moves onto a
shared envelope module with no behaviour change.
Jinwoo-H
b76572a274