Register a per-instance wakeUrl and forward it to the connector at
self-provision so a suspended gateway can be poked awake when buffered
work arrives (pairs with the connector-side WakePoker).
- relay_wake_url() resolver (env GATEWAY_RELAY_WAKE_URL, then
gateway.relay_wake_url in config.yaml), mirroring relay_instance_id()
- thread wake_url through _post_provision (adds wakeUrl to the body only
when set) + self_provision_relay (resolve, forward, log)
- hermes gateway enroll --wake-url <url> persists GATEWAY_RELAY_WAKE_URL
- document the §5.2 wake poke in relay-connector-contract.md §3.3
- tests: relay_wake_url resolution (env/config/absent), provision
forwarding, body-only-when-set (6 new; 130 relay tests pass)
The actual reconnect+drain on wake is Unit B's loop; this unit only
wires the wake SIGNAL. Opt-in: absent wakeUrl => connector never pokes.
6e88f7b6f7