feat(01-05): implement graceful shutdown with signal handlers

- GracefulShutdown class handles SIGTERM, SIGINT, SIGHUP
- 10-second timeout before force exit
- Double SIGINT forces immediate exit
- Shutdown sequence: stop HTTP server, stop processes, cleanup
- Integrates with CoordinationServer and ProcessManager

src/cli/index.ts

@@ -8,6 +8,7 @@
 import { Command } from 'commander';
 import { VERSION } from '../index.js';
 import { CoordinationServer } from '../server/index.js';
+import { GracefulShutdown } from '../server/shutdown.js';
 import { ProcessManager, ProcessRegistry } from '../process/index.js';
 import { LogManager } from '../logging/index.js';
 
@@ -42,17 +43,9 @@ async function startServer(port?: number): Promise<void> {
     process.exit(1);
   }
 
-  // Import shutdown handler (will be implemented in Task 2)
-  // For now, just handle basic signals
-  const handleSignal = async (signal: string) => {
-    console.log(`\nReceived ${signal}, shutting down...`);
-    await server.stop();
-    await processManager.stopAll();
-    process.exit(0);
-  };
-
-  process.on('SIGTERM', () => handleSignal('SIGTERM'));
-  process.on('SIGINT', () => handleSignal('SIGINT'));
+  // Install graceful shutdown handlers
+  const shutdown = new GracefulShutdown(server, processManager, logManager);
+  shutdown.install();
 }
 
 /**