feat(heartbeat): add process memory and backup health checks

src/backup/scheduler.ts

@@ -3,6 +3,7 @@ import type { BackupConfig } from '../config/schema.js';
 import type { OutboundMessage } from '../channels/types.js';
 import { parseDuration } from '../session/index.js';
 import { runBackupSnapshot } from './run.js';
+import { initBackupHealth, markBackupFailure, markBackupSuccess } from './status.js';
 
 interface ChannelLookup {
   get(name: string): { send(peerId: string, message: OutboundMessage): Promise<void> } | undefined;
@@ -28,6 +29,7 @@ export class BackupScheduler {
   }
 
   start(): void {
+    initBackupHealth(this.deps.backupConfig.enabled);
     if (!this.deps.backupConfig.enabled) {
       return;
     }
@@ -92,10 +94,12 @@ export class BackupScheduler {
         backupConfig: this.deps.backupConfig,
       });
       console.log(`Backup completed: ${result.archivePath}${result.uploaded && result.remotePath ? ` -> ${result.remotePath}` : ''}`);
+      markBackupSuccess();
       await this.handleSuccess();
     } catch (error) {
       const message = error instanceof Error ? error.message : String(error);
       console.error(`Backup failed: ${message}`);
+      markBackupFailure(message);
       await this.handleFailure(message);
     } finally {
       this.running = false;