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/src/config.ts

@@ -2,6 +2,8 @@ export interface Config {
   port: number;
   databaseUrl: string | undefined;
   serveUi: boolean;
+  heartbeatSchedulerEnabled: boolean;
+  heartbeatSchedulerIntervalMs: number;
 }
 
 export function loadConfig(): Config {
@@ -9,5 +11,7 @@ export function loadConfig(): Config {
     port: Number(process.env.PORT) || 3100,
     databaseUrl: process.env.DATABASE_URL,
     serveUi: process.env.SERVE_UI === "true",
+    heartbeatSchedulerEnabled: process.env.HEARTBEAT_SCHEDULER_ENABLED !== "false",
+    heartbeatSchedulerIntervalMs: Math.max(10000, Number(process.env.HEARTBEAT_SCHEDULER_INTERVAL_MS) || 30000),
   };
 }