The heartbeat now carries capabilities (per protocol v2 update).
On each heartbeat, capabilities are updated in the agent registry.
On auto-heal (server restart), capabilities from the heartbeat
are used instead of empty Map.of(), so the agent's feature flags
(replay, routeControl, logForwarding, etc.) are restored
immediately on the first heartbeat.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>