Implement agent runtime services and WebSocket realtime

Expand heartbeat service with full run executor, wakeup coordinator,
and adapter lifecycle. Add run-log-store for pluggable log persistence.
Add live-events service and WebSocket handler for realtime updates.
Expand agent and issue routes with runtime operations. Add ws dependency.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/package.json

@@ -16,6 +16,7 @@
     "express": "^5.1.0",
     "pino": "^9.6.0",
     "pino-http": "^10.4.0",
+    "ws": "^8.19.0",
     "zod": "^3.24.2"
   },
   "devDependencies": {